— costally , adv.
/kos"tl, kaws"tl/ , adj.
1. Anat. pertaining to the ribs or the upper sides of the body: costal nerves.
2. Bot. , Zool. pertaining to, involving, or situated near a costa.
[ 1625-35; costalis of the ribs, equiv. to L cost ( a ) rib, side + -alis -AL 1 ]