Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A sheath formed at the node of a stem by the fusion of two stipules, found in many plants of the family Polygonaceae, such as rhubarb.

from The Century Dictionary.

  • noun 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.
  • noun In zoology, a sheath; an investing part like or likened to an ocrea of a plant. Also, erroneously, ochrea.

from the GNU version of the Collaborative International Dictionary of English.

  • noun See ochrea.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

Etymologies

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

[Latin, greave.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin ocrea ("greave, legging")

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