Botany. the bud of the ascending axis of a plant while still in the embryo.
Ornithology. a down feather.
- plu·mu·lar [ploom-yuh-ler], /ˈplum yə lər/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use plumule in a sentence
The plumule consists of successive layers of rudimentary leaves, the outer enclosing the rest (Fig. 10, 1, c).Outlines of Lessons in Botany, Part I; From Seed to Leaf | Jane H. Newell
The terminal growing bud of the axis is called the plumule or gemmule (g), and represents the ascending axis.
Within the cotyledons the primordial leaves are seen, constituting the plumule or first bud of the plant.
Radicle hardly any; cotyledons thick and fleshy, enclosing a well-developed plumule.
Embryo thick and fleshy, "with a large concealed cavity at the summit, the plumule curved in a groove on the outside."
British Dictionary definitions for plumule
the embryonic shoot of seed-bearing plants
a down feather of young birds that persists in some adults
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for plumule
The young shoot of a plant embryo, situated above the cotyledons and consisting of the epicotyl and often of immature leaves. See more at germination.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.