Radicle 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.

Radicle n. : A rootlet; a radicel.

Example:
How can you tell the difference between the Radicle and hypocotyl in mung bean sprouts?

Taxonomy
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Defination from the web:
radicle is the first part of a seedling (a growing plant embryo) to emerge from the seed during the process of germination. The radicle is the embryonic root of the plant, and grows downward in the soil (the shoot emerges from the plumule) ...