bicostate

== English == === Etymology === From bi- +‎ costate. === Adjective === bicostate (not comparable) (botany) Having two principal ribs running longitudinally, as in a leaf. (zoology, said of shells) having two ribs (zoology) having two lines === References === “bicostate”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.