pinnule
Concise Oxford English Dictionary © 2008 Oxford University Press:
pinnule /ˈpɪnjuːl/
▶noun
- 1 Botany a secondary division of a pinnate leaf.
- 2 Zoology a part or organ like a small wing or fin.
– origin C16 (denoting one of the sights of an astrolabe): from L. pinnula ‘small wing’, dimin. of pinna.
'pinnule' also found in these Oxford entries:

