Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Botany Any of the ultimate leaflets of a bipinnately compound leaf.
  • n. Zoology A featherlike or plumelike organ or part, such as a small fin, or one of the appendages of a crinoid.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of the ultimate leaflets of a bipinnate or tripinnate leaf; a subleaflet.

from the GNU version of the Collaborative International Dictionary of English

  • n. One of the small divisions of a decompound frond or leaf. See Illust. of Bipinnate leaf, under bipinnate.
  • n. Any one of a series of small, slender organs, or parts, when arranged in rows so as to have a plumelike appearance

from The Century Dictionary and Cyclopedia

  • n. A pinnula.
  • n. In ichthyology, specifically, a small fin-like appendage.
  • n. In botany, a secondary pinna; one of the pinnately disposed divisions of a pinna: noting especially the ultimate divisions of the frond in ferns. Also pinnula. See cuts under indusium and Nothochlæna.
  • n. A small pin fixed upon a pre-telescopic astronomical instrument and serving, like the sight of a gun, to enable the observer to make an accurate pointing upon a star or other celestial object.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. division of a usually pinnately divided leaf

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

Latin pinnula, diminutive of pinna, feather; see pet- in Indo-European roots.

Examples

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