- Anat. a rib
- a riblike part, as the thickened fore edge of an insect's wing or the central vein of a leaf
Origin of costaModern Latin from L, a rib (from source coast)
nounpl. cos·tae, Biology
A rib or a riblike part, such as the midrib of a leaf or a thickened anterior vein or margin of an insect's wing.
Origin of costaLatin; see kost- in Indo-European roots.
(plural costas or costae)
- (anatomy) A rib.
- (biology) A riblike part of a plant or animal, such as a middle rib of a leaf or a thickened vein or the margin of an insect wing.
OriginSee also: cósta
From Latin costa (cognate with coast).