unicostate

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.

Origin:
1840–50; uni- + costate

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World English Dictionary
unicostate (ˌjuːnɪˈkɒsteɪt)
 
adj
biology having only one rib or riblike part: unicostate leaves

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