Definitions

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

  • n. Botany The part of a plant embryo that develops into a root.
  • n. Anatomy A small structure, such as a fibril of a nerve, that resembles a root.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The rudimentary shoot of a plant which supports the cotyledons in the seed, and from which the root is developed downward; the root of the embryo.
  • n. A rootlet.

from the GNU version of the Collaborative International Dictionary of English

  • n. The rudimentary stem of a plant which supports the cotyledons in the seed, and from which the root is developed downward; the stem of the embryo; the caulicle.
  • n. A rootlet; a radicel.

from The Century Dictionary and Cyclopedia

  • n. In botany:
  • n. A rootlet: same as radicel.
  • n. Specifically, same as caulicle: by late writers appropriately restricted to the rudimentary root at the lower extremity of the caulicle.
  • n. In anatomy and zoology, a little root or root-like part; a radix: as, the radicles of a vein (the minute vessels which unite to form a vein); the radicle of a nerve.
  • n. In philology, same as radical, 1.
  • n. In chem., same as radical, 2.
  • n. In the graptolites, the proximal extension of the virgula.

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

  • n. (anatomy) a small structure resembling a rootlet (such as a fibril of a nerve)

Etymologies

Latin rādīcula, diminutive of rādīx, rādīc-, root; see wrād- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin radicula. (Wiktionary)

Examples

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  • 1671 Philos. Trans. (Royal Soc.) 6 3037 The one is called by him (sc. Grew) the Radicle, being that, which, upon the vegetation of the Seed, becomes the Root.

    July 20, 2008