• WordNet 3.6
    • n plumule down feather of young birds; persists in some adult birds
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Webster's Revised Unabridged Dictionary
    • Plumule (Zoöl) A down feather.
    • Plumule (Zoöl) One of the featherlike scales of certain male butterflies.
    • Plumule (Zoöl) The aftershaft of a feather. See Illust. under Feather.
    • Plumule (Bot) The first bud, or gemmule, of a young plant; the bud, or growing point, of the embryo, above the cotyledons. See Illust. of Radicle.
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Century Dictionary and Cyclopedia
    • n plumule In ornithology, a down-feather; a feather of plumulaceous structure throughout.
    • n plumule In entomology: A little plume-like organ or ornament.
    • n plumule One of the peculiar obcordate scales found on the wings of certain lepidopterous insects, as Pieridæ.
    • n plumule The bud of the ascending axis of a plant while still in the embryo, situated at the apex of the caulicle (or radicle), above the base of the cotyledon or cotyledons, and inclosed by them when there are two or more. In such seeds as the bean and beech- nut it consists of a rudimentary pair of leaves of a feather like appearance, while in the pea and acorn it is a rudimentary stem which will develop leaves only when germination is considerably advanced. In these examples the plumule is manifest, but often it is scarcely visible to the naked eye until the seed begins to germinate. See also cuts under exogen and monocotyledonous.
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Chambers's Twentieth Century Dictionary
    • n Plumule plōō′mūl (bot.) the first bud of a plant growing from seed, springing from between the cotyledons or seed leaves: a soft feather: a feathery scale on a butterfly's wing
    • Plumule Also Plum′ula
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Webster's Revised Unabridged Dictionary
L. plumula, dim. of pluma, a feather; cf. F. plumule,


In literature:

They may also be divided into those with and without the plumule.
"Outlines of Lessons in Botany, Part I; From Seed to Leaf" by Jane H. Newell
It is important that the leaves on the primary axis arising from the plumule are examined.
"Northern Nut Growers Association Thirty-Fourth Annual Report 1943" by Various
Plumules: specialized scales of the androconia of male Lepidoptera.
"Explanation of Terms Used in Entomology" by John. B. Smith
The sheath which envelopes the radicle is called =coleorhiza= and that of the plumule, =pileole= or =germ-sheath=.
"A Handbook of Some South Indian Grasses" by Rai Bahadur K. Ranga Achariyar
Cotyledons opened to show the radicle a, and the plumule.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4" by Various
For example, the single plumule which develops from a germinating wheat embryo has at its upper end a hundred or more tiny growing points.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher
When there is such a bud between the cotyledons in the seed or seedling it is called the PLUMULE.
"The Elements of Botany" by Asa Gray
Within the cotyledons the primordial leaves are seen, constituting the plumule or first bud of the plant.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3" by Various
Finally the plumule escapes, its leaves successively breaking through at the tip of the germ-sheath.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3" by Various
Embryo with a single cotyledon, and the leaves of the plumule alternate.
"The Manual of the Botany of the Northern United States" by Asa Gray
Draw to show outer coat, cotyledon, hypocotyl, and plumule.
"A Civic Biology" by George William Hunter