pinnule definition

  • noun:
    • Botany some of the ultimate leaflets of a bipinnately element leaf.
    • Zoology A featherlike or plumelike organ or part, like a small fin, or among appendages of a crinoid.
    • some of the ultimate leaflets of a bipinnate or tripinnate leaf; a subleaflet.
    • One of the little divisions of a decompound frond or leaf. See Illust. of Bipinnate leaf, under bipinnate.
    • Any one of a number of small, thin body organs, or parts, whenever organized in rows in order to have a plumelike appearance
    • A pinnula.
    • In ichthyology, specifically, a little fin-like appendage.
    • In botany, a secondary pinna; one of the pinnately disposed divisions of a pinna: noting particularly the ultimate divisions associated with frond in ferns. Additionally pinnula. See cuts under indusium and Nothochl├Žna.
    • A small pin fixed upon a pre-telescopic astronomical instrument and serving, like picture of a gun, to enable the observer in order to make an exact pointing upon a star or any other celestial object.
    • unit of a usually pinnately divided leaf

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