noun

definition

The visible part of the ear that resides outside of the head, the auricle; outer ear excluding the ear canal.

definition

A leaflet or primary segment of a pinnate compound leaf.

definition

A feather, wing, fin, or other similar appendage.

Examples of pinna in a Sentence

The development of the sporocarp shows that it corresponds to a pinna, although when mature it may appear to occupy a ventral position in relation to the vegetative portion of the leaf.

Such eyes on the mantle-edge are found in Pecten, Spondylus, Lima, Pinna, Pectunculus, Modiola, Cardium, Tellina, Mactra, Venus, Solen, Pholas and Galeomma.

The Cyas type of frond, except as regards the presence of a midrib in each pinna, characterizes the cycads generally, except Bowenia and Stangeria.

Its nearest allies are Pinna among living forms, Eligmus among fossils.

B, Section of the rachis bearing a single pinna.

The sporangia arise simultaneously in the sorus, which is borne on the under surface of the ordinary pinna; in those species with large sporangia the latter form a single circle, in others sporangia may also arise from the central part of the receptacle.

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