noun

• A female given name from Latin.
• A surname from Old French derived from place names in Normandy based on a male personal name, from Latin Lucius.
• The fossilized partial skeleton of a female Australopithecus afarensis, an early hominin; also, the individual whose skeleton this was.
• (slang) The drug LSD.
• (archaic) The northern pike (a kind of fish).