Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Botany One of the secondary divisions of a binnately compound leaf.
- noun Zoology A small featherlike part or subdivision of an appendage, especially one of the small branches on the arm of a crinoid.
from The Century Dictionary.
- noun A pinnula.
- noun In ichthyology, specifically, a small fin-like appendage.
- noun 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 underindusium and Nothochlæna. - noun 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 the GNU version of the Collaborative International Dictionary of English.
- noun (Bot.) One of the small divisions of a decompound frond or leaf. See
Illust. of Bipinnate leaf, underbipinnate . - noun (Zoöl.) Any one of a series of small, slender organs, or parts, when arranged in rows so as to have a plumelike appearance
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun botany Any of the ultimate
leaflets of abipinnate ortripinnate leaf ; asubleaflet .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun division of a usually pinnately divided leaf
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
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Examples
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Conrad Labandeira himself talks about this in a 1998 review paper, in which he describes: “spore feeding and piercing-and sucking” [in the early Devonian], “External feeding on pinnule margins and the intimate and intricate association of galling” [in the Carboniferous], “hole feeding and skeletonization” [in the early Permian], “surface fluid feeding”, and possible but inconclusive evidence of “mutualistic relationships between insect pollinivores and seed plants” by the end of the Paleozoic.
Behe and bugs: Genesis of a Creationist canard? - The Panda's Thumb 2005
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At the end of each of the small divisions of the compound leaflet there is, when the leaf first unfolds, a little yellow fruit-like body united by a point at its base to the end of the pinnule.
Journeys Through Bookland, Vol. 7 Charles Herbert Sylvester
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Sori on the edge of a pinnule terminating a vein; sporangia at the base of a long, bristle-like receptacle surrounded by a cup-shaped indusium.
The Fern Lover's Companion A Guide for the Northeastern States and Canada George Henry Tilton
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The indusium whitish and sometimes herbaceous, formed of the reflexed margin of the lobes or of the whole pinnule.
The Fern Lover's Companion A Guide for the Northeastern States and Canada George Henry Tilton
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Pinnules on the inferior side of the pinnæ often elongated, especially the lower pair, the pinnule nearest the rachis being usually the longest, at least in the lowest pinnæ.
The Fern Lover's Companion A Guide for the Northeastern States and Canada George Henry Tilton
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The main rib or vein of a segment, pinnule, pinna, or frond; a midvein.
The Fern Lover's Companion A Guide for the Northeastern States and Canada George Henry Tilton
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The indusium is formed of the altered margin of the pinnule, at first reflexed to the midrib, giving it a pod-like appearance, but at length opening out flat and exposing the sporangia.
The Fern Lover's Companion A Guide for the Northeastern States and Canada George Henry Tilton
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[Illustration] (2) Sporangia in oblong sori under a reflexed tooth of a pinnule; indusium broad; rachis dark and shining.
The Fern Lover's Companion A Guide for the Northeastern States and Canada George Henry Tilton
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The parts of the oak fern develop with great regularity, each pinna, pinnule and lobe having another exactly opposite to it nearly always.
The Fern Lover's Companion A Guide for the Northeastern States and Canada George Henry Tilton
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At the end of each of the small divisions of the compound leaflet there is, when the leaf first unfolds, a little yellow fruit-like body united by a point at its base to the end of the pinnule.
The Naturalist in Nicaragua Thomas Belt 1855
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