Definitions

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

  • adj. Having a single main costa, rib, or riblike part: a unicostate leaf.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having a single rib.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having a single rib or strong nerve running upward from the base; -- said of a leaf.

from The Century Dictionary and Cyclopedia

  • Having but one rib; in botany, noting those leaves which have one large vein running down the center, called the midrib. Those having more than one great division are called multicostate.
  • In zoology, having a single costa, rib, or nervure, as an insect's wing.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

uni- +‎ costate

Examples

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