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unicostate

[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.
Origin
1840-1850
1840-50; uni- + costate
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for uni-costate

unicostate

/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
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