pin·nule (p n y l) also pin·nu·la (pny -l)n. pl. pin·nules also pin·nu·lae (p ny-l  ) 1. Botany Any of the ultimate leaflets of a bipinnately compound leaf. 2. Zoology A featherlike or plumelike organ or part, such as a small fin, or one of the appendages of a crinoid. [Latin pinnula, diminutive of pinna, feather; see pet- in Indo-European roots.] pin nu·lar adj. |
pinnule [ˈpɪnjuːl], pinnula [ˈpɪnjʊlə]
n pl pinnules, pinnulae [ˈpɪnjʊˌliː]
1. (Life Sciences & Allied Applications / Botany) any of the lobes of a leaflet of a pinnate compound leaf, which is itself pinnately divided
2. (Life Sciences & Allied Applications / Zoology) Zoology any feather-like part, such as any of the arms of a sea lily
[from Latin pinnula, diminutive of pinna feather]
pinnular adj
| pinnule (pnyl) 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. |
pinnule - division of a usually pinnately divided leafWant to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content.
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