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Adjective: costate  kó-stut or 'kó,steyt
  1. (of the surface) having a rough, riblike texture
    "The costate leaf had prominent veins";
    - ribbed
     
  2. (anatomy) having ribs
    "The costate structure of the thorax protects vital organs"

See also: ribbed, rough, unsmooth

Encyclopedia: Costate