• Webster's Revised Unabridged Dictionary
    • a Unicostate (Bot) Having a single rib or strong nerve running upward from the base; -- said of a leaf.
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Century Dictionary and Cyclopedia
    • unicostate 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.
    • unicostate In zoology, having a single costa, rib, or nervure, as an insect's wing.
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Chambers's Twentieth Century Dictionary
    • adj Unicostate ū-ni-kos′tāt one-ribbed, having but one principal costa, rib, or nervure.
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Webster's Revised Unabridged Dictionary
Uni-, + costate,