Word Finder - gill

definition

(animal anatomy) a breathing organ of fish and other aquatic animals

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(of a fish) a gill slit or gill cover

example

Gill nets are designed to catch a fish by the gills.

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One of the radial folds on the underside of the cap of a mushroom, on the surface of which the spore-producing organs are borne

synonyms

• lamella

definition

(animal anatomy) the fleshy flap that hangs below the beak of a fowl; a wattle

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The flesh under or about the chin; a wattle

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(spinning) one of the combs of closely ranged steel pins which divide the ribbons of flax fiber or wool into fewer parallel filaments

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To remove the gills from a fish as part of gutting and cleaning it

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To catch (a fish) in a gillnet

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To be or become entangled in a gillnet

Naturally, it is among the free living forms that the parapodium is best developed, and least developed among the tubicolous belongs typically a long tentacle, the cirrus, which 'r podium or neuropodium, and may be developed into an arborescent gill or into a flat scale-like process, A the elytron (in Polynoe, &c.).

Gill, and carried in 1907 within 70 m.

L is the condition of outgrowth with gl, gill lamellae.

Thus the base of the gill passes in a slanting direction across the right-hand side of the kidney, the posterior end being dorsal to the apex of the gland, and the anterior end ventral to the right-hand corner.

Zoologists are familiar with many instances (fishes, crustaceans) in which the protective walls of a water-breathing organ or gill-apparatus become converted into an air-breathing organ or lung, but there is no other case known of the conversion of gill processes themselves into air-breathing plates.

Each gill has the structure of a typical molluscan ctenidium, consisting of an axis bearing an anterior and posterior row of filaments or lamellae.

The failure of the method based on transits of Venus led to an international effort carried out on the initiative of Sir David Gill to measure the parallax by observations on those minor planets which approach nearest the earth.

The drawback of greater distance was, however, in Gill's opinion, more than compensated by the accuracy with which the observations could be made.

The instruments used were heliometers, the construction and use of which had been greatly improved, largely through the efforts of Gill himself.

These observations.were worked up and discussed by Gill with great elaboration in the Annals of the Cape Observatory, vols.

This last value agrees very closely with a determination made by Gill at the Cape of Good Hope, and most other recent determinations give values exceeding 20.50".

The instrument then passed, by purchase from Gill, to Lord McLaren, by whom it was presented to the Royal Observatory, Edinburgh.

When the heliometer-part of Lord Lindsay's heliometer was acquired by Gill in 1879, he changed the manner of imparting the motion in question.

Gill introduced a powerful auxiliary to the accuracy of heliometer measures in the shape of a reversing prism placed in front of the eye-piece, between the latter and the observer's eye.

The sexes are distinct, and the generative opening is on the side of the body above the edge of the inner lamella of the inner gill.

Al' Gill University at Montreal has been enlarged and splendidly endowed by the munificence of a few private individuals; Toronto University by the provincial legislature of Ontario; Queen's University at Kingston largely by the support of its own graduates and friends.

The filaments of the gill (ctenidium) of Mytilus and Arca thus form two closely set rows which depend from the axis of the gill like two parallel plates.

As the axis of the ctenidium lies by the side of the body, and is very frequently connate with the body, as so often happens in Gastropods also, we find it convenient to speak of the two plate-like structures formed on each ctenidial axis as the outer and the inner gill-plate; each of these is composed of two lamellae, an outer (the reflected) and an adaxial in the case of the outer gill plate, and an adaxial and an inner (the reflected) in the case of the inner gill-plate.

The gill axis d is seen lying in the sub-pallial chamber between the foot b and the mantle c. From it depend the gillfilaments or lamellae - formed by united filaments - drawn as black lines f.

In the filaments of the gill of Protobranchia and many Filibranchia the tubular cavity is divided by a more or less complete fibrous septum into two channels, for an afferent and efferent blood-current.

Rudimentary cephalic eyes occur in the Mytilidae and in Avicula at the base of the first filament of the inner gill, each consisting of a I pigmented epithelial fossa containing a cuticular lens.

In addition to the characters given above, it may be noted that the mantle is provided with a hypobranchial gland on the outer side of each gill, the auricles are muscular, the kidneys are glandular through their whole length, the sexes are separate.

In the majority of Gastropoda one gill and one auricle are lost.

Therefore, when gill drawing machinery was invented, the cutting of silk into short fibres ceased, and long silks are now prepared for spinning on what is known as " long spinning process."

A faller or gill drawing machine consists of a long feeding sheet which conveys silk to a pair of rollers (back rollers).

From the last head of drawing the sliver is taken to a machine known as a gill rover.

Both the openings are close together, the external opening being just in front of the principal gill near the posterior end of the body.

The venous blood is conducted from the tissues to a large sinus on either side above the pallial groove, and from this sinus passes to the gills by an afferent vessel in each gill on the internal or pedal margin of the axis.

The oxygenated blood is carried from each gill by an efferent vessel on the external or pallial side of the axis to another longitudinal vessel which leads to the auricle on each side.

In Lepidopleuridae an osphradium occurs at the base of each gill.

From 1855 to 1893 he was professor of geology and principal of M`Gill University, Montreal, an institution which under his influence attained a high reputation.

His SOn, George Mercer Dawson (1849-1901), was born at Pictou on the 1st of August 1849, and received his education at M ` Gill University and the Royal School of Mines, London, where he had a brilliant career.

But Sir David Gill found from experience and careful comparison that a silvered mirror of 12-in.

Sir David Gill tested the equatorial coude on double stars at the Paris Observatory in 1884, and his last doubts as to the practical value of the instrument were dispelled.

Others had by their own efforts obtained a large amount of learning, amongst whom Dr John Gill was eminent for his knowledge of Hebrew, as shown in his Exposition of the Holy Scriptures, a work in 9 vols.

The designation of the machine indicates the particular method in which the gill pins are moved.

The City has a Carnegie library, Gill hospital, a Y.M.C.A.

The chief are Aysgarth Force, on the main stream, Mill Gill Force on a tributary near Askrigg, and Hardraw Scaur beyond Hawes, the finest of all, which shoots forth over a projecting ledge of limestone so as to leave a clear passage behind it.

Very often the basal segment of the protopodite bears, on the outer side, a lamellar appendage (more rarely, two), the epipodite, which may function as a gill.

It was at Ascension that Mr, afterwards Sir, David Gill determined, in 1877, the solar parallax.

The first really adequate determinations of solar parallax were those of Sir David Gill, measured by inference from the apparent diurnal shift of Mars among the stars as the earth turned diurnally upon its axis; the observations were made at the island of Ascension in 1878.

The disk of Mars and his colour are certain disadvantages, and Gill.

P. Langley's Researches on Solar Heat are published by the War Department (Signal Service, xv.) (Washington, 1884), and Gill's parallax researches in Cape Annals, vols.

These are the South African College at Cape Town (founded in 1829), the Victoria College at Stellenbosch, the Diocesan College at Rondebosch, Rhodes University College, Graham's Town, Gill College at Somerset East, the School of Mines at Kimberley and the Huguenot Ladies' College at Wellington.

Fishing operations are carried on extensively in Lake Erie, the fish being taken with gill nets, seins and pound nets.

Sir David Gill derived a highly satisfactory value of 8.78" for the long-sought constant from the opposition of Mars in 1877, and from combined heliometer observations at five observatories in 1888-1889 of the minor planets Iris, Victoria and Sappho, the apparently definitive value of 8.80" (equivalent distance, 92,874,000 m.).

Photographic star-charting was begun by Sir David Gill in 1885, and the third and concluding volume of the Cape Photographic Durchmusterung appeared in 1900.

In the north lie Loughs Melvin, close above Donegal Bay, and Gill near Sligo, Lough Gara, draining to the Shannon, and Lough Conn near Ballina (county Mayo), and in the south, the great expanses of Loughs Mask and Corrib, joined by a subterranean channel.

Gill, hold that " the heavenly family had taken up their abode in these birds, fishes, and reptiles."

Gill, Myths and Songs from the South Pacific, p. 60.