Answer:

costae

Answer	Crossword Clue
COSTAE	Ribs, in biology
COSTAE	Ribs
COSTAE	Ribs: Anat.

COSTAE	Skeletal PArts
COSTAE	Central veins of leaves

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.