Emily Dickinson Lexicon

RHI-ZO'MA, n. [Gr. ῥιζωμα, something firmly rooted.]

In botany, a large and fleshy or woody part or organ of a root, analogous to a stem under ground, which is neither a tuber nor a bulb. It is of very various forms, and always has radicles, and not infrequently fibrils growing from it. The esculent part of the root of a beet, carrot, or parsnep, furnishes a good example of a rhizoma.