verb
definition
To pierce; to penetrate.
definition
To make a line of holes in (a thin material) to allow separation at the line.
example
to perforate a sheet of postage stamps
adjective
definition
Pierced with holes.
Examples of perforated in a Sentence
The wall between them is perforated, giving passage to coarse strands of protoplasm.
With another form of gas stove coke is used in place of the perforated asbestos; the fire is started with the gas, which, when the coke is well alight, may be dispensed with, and the fire kept up with coke in the usual way.
It is evident that accurate knowledge of the character and structure of the rock-formations in petroliferous territories is of the greatest importance in enabling the expert to select favourable sites for drilling operations; hence on well-conducted petroleumproperties it is now customary to note the character and thickness of the strata perforated by the drill, so that a complete section may be prepared from the recorded data.
In front of the naked eye was held a piece of copper foil perforated by a fine needle hole.
Above is a graceful balustrade behind which is a lofty roof, and at the angles are towers perforated for the passage of the light.
Bryan, in which the analytical equations of motion are deduced of a perforated solid in liquid, from considerations purely hydrodynamical.
The melting pans are generally circular vessels, fitted with a perforated false bottom, on which the sugar to be melted is dumped.
The bottom of a crucible is perforated by a pipe which projects into the crucible to about two-thirds of its height.
When the bud is nearly complete, the body-wall of the parent immediately below it becomes perforated, placing the coelenteric cavity of the parent in secondary communication with that of the bud (H), doubtless for the better nutrition of the latter.
Cells of this type are often called trumpet-hyphae (though they have no connection with the hyphae of Fungi), and in some genera of Laminariaceae those at the periphery of the medulla simulate the sieve-tubes of the higher plants in a striking degree, even (like these latter) developing the peculiar substance callose on or in the perforated cross-walls or sieve-plates.
For pumping a well a valved working-barrel with valved sucker is attached to the lower end of the tubing, a perforated " anchor " being placed below.
This apparatus has an oil-cup consisting of a cylindrical brass or gunmetal vessel, the cover of which is provided with three rectangular holes which may be closed and opened by means of a perforated slide moving in grooves; the movement of the slide causes a small oscillating colzaor rape-oil lamp to be tilted so that the flame (of specified size) is brought just below the surface of the lid.
Most of these are perforated for mounting on threads or wires, and had been, no doubt, originally connected together to form one or more of the elaborate girdles, necklaces and breast ornaments then worn by the women.3 On the bottom of the stone box there was similar dust, pieces of bone and jewelry, and also remains of what had been vessels of wood.
A third method consists in placing the specimen within bibulous paper, and enclosing the whole between two plates of coarsely perforated zinc supported in a wooden frame.
Solid impurities speedily become crushed, and are carried away by the water, while the rubber takes the form of an irregular sheet perforated by numerous holes.
Small objects are often heaped together in perforated trays or ladles, the cathode connecting-rod being buried in the midst of them.
Uncemented brickwork, or perforated ironwork, are xxvill.
Tall column heels, £ 48.00 Black leather 80's petal perforated stiletto shoes Classic 80's black leather stiletto shoes with a pretty feminine twist.
You'll also find an amazingly versatile shirt dress and perforated jelly flats.
A popular type of foundation garment today, panty girdles have undergone many changes since the first ones, made of perforated rubber, were introduced into the fashion world in the 1930s.
It revolves with the smallest possible clearance in a chamber of masonry, one of the side walls being perforated by a large round hole, through which the air from the mine is admitted to the centre of the fan.
The Suidae include the Old World pigs (Suinae) and the American peccaries (Dicotylinae), and are characterized by the snout terminating in a fleshy disk-like expansion, in the midst of which are perforated the nostrils; while the toes are enclosed in sharp hoofs, of which the lateral ones do not touch the ground.
At any rate stones were sawed, shaped, polished, carved and perforated, not only by the Mexicans, but among other tribes.
Bunsen may be regarded as the originator of the second method, and it was he who devised the small cone of platinum foil, sometimes replaced by a cone of parchment perforated with pinholes, arranged at the apex of the funnel to serve as a support for the paper, which is apt to burst under the pressure differences.
In the so-called "Buchner funnel," the filtering vessel is cylindrical, and the paper receives support by being laid upon its flat perforated bottom.
C. Gooch, which has come into common use in quantitative analysis where the solid matter has to be submitted to heating or ignition, consists of a crucible having a perforated bottom.
By means of a piece of stretched rubber tubing, this crucible is supported in the mouth of an ordinary funnel which is connected with an exhausting apparatus; and water holding in suspension fine scrapings of asbestos, purified by boiling with strong hydrochloric acid and washing with water, is run through it, so that the perforated bottom is covered with a layer of felted asbestos.
A perforated cone, similarly coated with asbestos and fitted into a conical funnel, is sometimes employed.
The material is placed in a perforated cage or "basket," which is enclosed in an outer casing, and when the cage is rapidly rotated by suitable gearing, the liquid portions are forced out into the external casing.
When the armature is rotated, these two coils endeavour to place themselves in certain directions in the field so as to be perforated by the greatest magnetic flux.
A still simpler form of siren may be constituted with a good spinning-top, a perforated card disk, and a tube for blowing with.
During electrolysis, oxygen is evolved at the anode and escapes from the outer vessel, while the sodium deposited in globules on the cathode floats upwards into the iron cylinder, within which it accumulates, and from which it may be removed at intervals by means of a perforated iron ladle, the fused salt, but not the metal, being able to pass freely through the perforations.
A pair of coiled nephridial tubes (n) formed of a file of perforated `' drain-pipe "cells, with ciliated tag-like" flame "cells (f), open into a contractile bladder (bl), FIG.
Bdelloidaceae; foot with two toes and accessory spurs or a simple perforated disk; body telescopic at either end, with an antero-dorsal proboscis ending in a ciliate cup and bearing the proximal antenna; corona usually bilobed, very wheel-like.
Body elongated with a narrow neck above the disk; foot ending in a terminal perforated disk.
Anomiidae.-Foot small; inferior (right) valve of adult perforated to allow passage of the byssus.
They agree with primitive nephridia in being of ectodermic origin, in consisting of perforated cells in linear series, and in having no communication with the coelom.
Smaller pieces are thrown into a bath of melted carnallite and pressed together with an iron rod, the bath being then heated until the globules of metal float to the top, when they may be removed in perforated iron ladles, through the holes in which the fused chloride can drain away, but through which the melted magnesium cannot pass by reason of its high surface tension.
A piston made of such a perforated substance, therefore, may be used to exert pressure on the liquid, while all the time the vapour is able to pass.
By evaporation and condensation, then, the solvent can pass through this perforated partition, which thus acts as a perfect semi-permeable membrane.
Spores usually two-celled, either with a strongly thickened cross-wall often perforated by a narrow canal or with crosswall only slightly thickened.
In Merulius lacrymans Hartig has observed thin-walled hyphae with large lumina, the septa of which are perforated like those of sieve-tubes.
The disintegrated ground is then brought back in the trucks and fed through perforated cylinders into the washing pans; the hard blue which has resisted disintegration on the floors, and the lumps which are too big to pass the cylindrical sieves, are crushed before going to the pans.
Ornaments of perforated teeth and shells are found.
Agarum, Claudea and Struvea are leaf-forms which are perforated like Aldrovanda among flowering plants.
The air-pipe goes right to the bottom of the cylinder and there branches out into perforated side-pipes, so that the mass is thoroughly stirred up all the time.
It is continued until the contents of the pan have been coverted into a thick paste of small crystals of monohydrated sodium carbonate, permeated by a mother-liquor which is removed by draining on perforated plates or by a centrifugal machine, and is always returned to the pans.
This arrangement has the effect that the salts, as they separate out, slide down the sloping part and arrive in the central channel, which is not exposed to the fire-gases, so that they quietly settle there, without caking to the pan, until they are fished out by means of perforated ladles.
This is a tall iron erection, built up from superposed cylinders, which are separated from one another by perforated horizontal diaphragms, con this recovery is carried out in the most efficient manner, the process cannot possibly pay; but so much progress has been made in this direction that the loss of ammonia is very slight indeed, merely a fraction per cent.
Both these reactions are carried out in tall cylindrical columns or " stills," consisting of a number of superposed cylinders, having perforated horizontal partitions, and provided with a steam-heating arrangement in the enlarged bottom portion.