Pinna

pin′a, n. a single leaflet of a pinnate leaf: a wing, fin, or the like: the auricle of the ear:— pl. Pinn′æ .— adjs. Pinn′ate , -d , shaped like a feather: furnished with wings or fins.— adv. Pinn′ately .— adjs. Pinnat′ifid , cut as a leaf, half-way down or more, with the divisions narrow or acute; Pinnat′isect ( bot. ), pinnately divided; Pinn′iform , like a feather or fin: pinnate; Pinn′igrade , moving by fins—also n. ; Pinn′iped , Pinnat′iped , fin-footed, as a bird; Pinn′ūlate , -d .— n. Pinn′ūle , one of the branchlets of a pinnate leaf: one of the lateral divisions of the finger-like stalks of an encrinite—also Pinn′ūla .— Pinnate leaf , a compound leaf wherein a single petiole has several leaflets attached to each side of it. [L. pinna , a feather, dim. pinnula .]