the lower part of the axis of an embryo; the primary root. See diag. under plumule.
a rudimentary root; radicel or rootlet.
Chemistry. (formerly) radical ( def 12 ).
Anatomy. a small rootlike part or structure, as the beginning of a nerve or vein.

1665–75; < Latin rādīcula small root, equivalent to rādīc- (stem of rādīx) root1 + -ula -ule

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World English Dictionary
radicle (ˈrædɪkəl)
1.  botany
 a.  part of the embryo of seed-bearing plants that develops into the main root
 b.  a very small root or rootlike part
2.  anatomy any bodily structure resembling a rootlet, esp one of the smallest branches of a vein or nerve
3.  chem a variant spelling of radical
[C18: from Latin rādīcula a little root, from rādīx root]

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American Heritage
Medical Dictionary

radicle rad·i·cle (rād'ĭ-kəl)
A small structure, such as a fibril of a nerve, that resembles a root.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
radicle   (rād'ĭ-kəl)  Pronunciation Key 
  1. The part of a plant embryo that develops into a root. In most seeds, the radicle is the first structure to emerge on germination.

  2. A small anatomical structure, such as a fibril of a nerve, that resembles a root.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for radicle
It is through one of these that the radicle emerges when the embryo germinates.
Beginning of seed imbibition, bean swollen, whitish, no radicle visible.
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