Having a ridge or shaped like a ridge or the keel of a ship:; SYN. carinate, carinated, keeled.

ETYM Latin serratus, from serra a saw; perhaps akin to secare to cut, Eng. saw a cutting instrument. Related to Sierra.
Notched like a saw with teeth pointing toward the apex; SYN. serrated, saw-toothed, toothed, notched.
Having notched or toothed edge.