costate

adjective
cos·tate | \ˈkäˌstāt, -stə̇t\

Definition of costate 

: having ribs: such as

a : having one or more longitudinal ribs or nerves a costate leaf

b : having ridges on the surface a costate shell

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History and Etymology for costate

Latin costatus, from costa rib + -atus -ate

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