Dictionary.net

Same as Cormus, 2.

A bulblike fleshy stem, short, and of solid texture, as in the crocus.

The underground stem of certain plants, giving off leaves from the upper surface and rootlets from the lower; it is of bulbous shape, but differs from a tree bulb in being of solid, fleshy consistency and not composed of superposed leaves; called also solid bulb, especially when it is enclosed in two or three layers of broad leaves.

In bot., a short, roundish, bulb-like underground stem, not formed of concentric layers, but solid, as in the crocus, gladiolus, &c.

A form of bulb in which the scales are indistinguishable, the whole appearing as a solid organ, as in Colchicum. [Gr.]