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unicostate

[yoo-ni-kos-teyt, -kaw-steyt]
adjective
  1. having only one costa, rib, or ridge.
  2. Botany. (of a leaf) having only one primary or prominent rib, the midrib.
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Origin of unicostate

First recorded in 1840–50; uni- + costate
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for unicostate

unicostate

adjective
  1. biology having only one rib or riblike partunicostate leaves
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012