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.

unicostate

/ ˌjuːnɪˈkɒsteɪt /

adjective

1. biology having only one rib or riblike part

   unicostate leaves

Word History and Origins

Origin of unicostate¹

First recorded in 1840–50; uni- + costate