Etymology
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radicle (n.)

1670s, in botany, "rootlet, part of the embryo of a plant which develops into the primary root," from Latin radicula, diminutive of radix "root" (from PIE root *wrād- "branch, root"). Anatomical sense of "branch of a nerve, vein, etc. resembling a root" is by 1830.

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Definitions of radicle

radicle (n.)
(anatomy) a small structure resembling a rootlet (such as a fibril of a nerve);
From wordnet.princeton.edu