ETYM Latin radicula, dim. of radix, -icis, root: cf. French radicule. Related to Radix.
Rootlike organ or part; Botany, portion of seed developing into root; Chemical, radical.
Part of a plant embryo that develops into the primary root. Usually it emerges from the seed before the embryonic shoot, or plumule, its tip protected by a root cap, or calyptra, as it pushes through the soil. The radicle may form the basis of the entire root system, or it may be replaced by adventitious roots (positioned on the stem).
(Anatomy) A small structure resembling a rootlet (such as a fibril of a nerve).