Emily Dickinson Lexicon

CORC'ULE, or CORC'LE, n. [L. corculum, but in a different sense. It is a diminutive from cor, the heart.]

In botany, the heart of the seed, or rudiment of a future plant, attached to and involved in the cotyledons. It consists of the plume or ascending part, and the rostel, or radicle, the simple descending part. – Martyn.