D defs.my
Entry 1 sense Webster, 1913

Costate

/(k?s"t?t)/ · Cos·tate · IPA /ˈkɒsteɪt/
01 a. Having ribs, or the appearance of ribs; (Bot.) having one or more longitudinal ribs.
  1. 1.
    Having ribs, or the appearance of ribs; (Bot.) having one or more longitudinal ribs.(Bot.)