costilla
/kosˈtiʝa/ · B1 · noun · f
rib
🍖 costa (Latin for rib, side) + -illa (little) = little rib; cf. English coast
Latin costa meant rib, and also side. The side sense gave English coast, the side of the land, and Spanish costado, a person's flank. Add the diminutive -illa and costilla is a little rib, one of the many along your side.