Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A protective sheath enclosing the embryonic root of grasses.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A sheath-like structure found in a plant seed that connects the coleoptile to the primary root and acts as a protective covering enclosing the plumule and radicle.

from the GNU version of the Collaborative International Dictionary of English

  • n. A sheath in the embryo of grasses, inclosing the caulicle.

from The Century Dictionary and Cyclopedia

  • n. In the embryo of many endogenous plants, the sheath covering the root, which bursts through it in germination.

Etymologies

New Latin : Greek koleon, sheath; see kel-1 in Indo-European roots + Greek rhiza, root; see wrād- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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