noun, plural pin·nae [pin-ee] /ˈpɪn i/, pin·nas.
- Botany. one of the primary divisions of a pinnate leaf.
- a feather, wing, or winglike part.
- a fin or flipper.
- Anatomy. auricle(def 1a).
noun plural -nae (-niː) or -nas
- any leaflet of a pinnate compound leaf
- zoology a feather, wing, fin, or similarly shaped part
- another name for auricle (def. 2)
n. pl. pin•nae (pĭn′ē)
Plural pinnae (pĭn′ē) pinnas
- A leaflet or primary division of a pinnately compound leaf, especially of a fern frond.