ˈkästə noun
( plural cos·tae -(ˌ)stē, -ˌstī)
Etymology: Latin, rib — more at coast
: a rib or a bodily structure resembling a rib: as
a. anatomy : the side or border of a part
b. botany : a leaf vein ; especially : midrib
c. zoology : any of various ridged or thickened linear parts ; specifically : the anterior vein of an insect's wing