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[pin-yool] /ˈpɪn yul/


Botany. a secondary pinna, one of the pinnately disposed divisions of a bipinnate leaf.
a metal plate with a small hole in it, used as a sight in a quadrant.
noun (pl) pinnules, pinnulae (ˈpɪnjʊˌliː)
any of the lobes of a leaflet of a pinnate compound leaf, which is itself pinnately divided
(zoology) any feather-like part, such as any of the arms of a sea lily
Any of the smaller leaflets into which each leaflet of a bipinnately compound leaf is subdivided. The leaves of many ferns are divided into pinnules.


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