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n. Botany Any of the ultimate leaflets of a bipinnately compound leaf.

n. Zoology A featherlike or plumelike organ or part, such as a small fin, or one of the appendages of a crinoid.

n. Any of the ultimate leaflets of a bipinnate or tripinnate leaf; a subleaflet.

n. One of the small divisions of a decompound frond or leaf. See Illust. of Bipinnate leaf, under bipinnate.

n. Any one of a series of small, slender organs, or parts, when arranged in rows so as to have a plumelike appearance

n. A pinnula.

n. In ichthyology, specifically, a small fin-like appendage.

n. In botany, a secondary pinna; one of the pinnately disposed divisions of a pinna: noting especially the ultimate divisions of the frond in ferns. Also pinnula. See cuts under indusium and Nothochlæna.

n. A small pin fixed upon a pre-telescopic astronomical instrument and serving, like the sight of a gun, to enable the observer to make an accurate pointing upon a star or other celestial object.

n. division of a usually pinnately divided leaf

"At the end of each of the small divisions of the compound leaflet there is, when the leaf first unfolds, a little yellow fruit-like body united by a point at its base to the end of the pinnule."

leaflet   

bipinnate