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unicostate

American  
[yoo-ni-kos-teyt, -kaw-steyt] / ˌyu nɪˈkɒs teɪt, -ˈkɔ steɪt /

adjective

  1. having only one costa, rib, or ridge.

  2. Botany. (of a leaf ) having only one primary or prominent rib, the midrib.

unicostate British  
/ ˌjuːnɪˈkɒsteɪt /

adjective

  1. biology having only one rib or riblike part

    unicostate leaves
"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

Etymology

Origin of unicostate

First recorded in 1840–50; uni- + costate

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.