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

  • n. A sheath formed at the node of a stem by the fusion of two stipules, as in the rhubarb plant.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A sheath around a plant stem forming from the stipule of a leaf and extending above the point of insertion of the leaf.

from the GNU version of the Collaborative International Dictionary of English

  • n. See ochrea.

from The Century Dictionary and Cyclopedia

  • n. In botany, a sheathing stipule, or a pair of stipules united into a sheath around the stem, like a legging or the leg of a boot; also sometimes, in mosses, the thin sheath around the seta, terminating the vaginula.
  • n. In zoology, a sheath; an investing part like or likened to an ocrea of a plant. Also, erroneously, ochrea.


Latin, greave.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin ocrea ("greave, legging") (Wiktionary)



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