See Also: Pinnule(medicine)
pinnule(dictionary)

pinnule (iou)



pinnule noun. . L16.
[Latin pinnula dim. of PINNA noun2: see -ULE.]
Either of two sights (usu. small perforated metal plates) at the ends of the alidade or index of an astrolabe, quadrant, or similar instrument. obsolete exc. Hist. L16.
Zoology. A part or organ resembling a small wing or fin, or a barb of a feather; spec. any of the jointed lateral branches along the arms of a crinoid. M18.
Botany. A subdivision of the pinna of a leaf, esp. of a fern; a leaflet; a lobe. L18.
pinnular adjective of or pertaining to a pinnule L19.
pinnulate adjective having pinnules E19.