Quick definitions from WordNet (taboo)
▸ noun: an inhibition or ban resulting from social custom or emotional aversion
▸ noun: a prejudice (especially in Polynesia and other South Pacific islands) that prohibits the use or mention of something because of its sacred nature
▸ verb: declare as sacred and forbidden
▸ adjective: forbidden to profane use especially in South Pacific islands
▸ adjective: excluded from use or mention ("A taboo subject")
▸ Also see taboo
▸ noun: an inhibition or ban resulting from social custom or emotional aversion
▸ noun: a prejudice (especially in Polynesia and other South Pacific islands) that prohibits the use or mention of something because of its sacred nature
▸ verb: declare as sacred and forbidden
▸ adjective: forbidden to profane use especially in South Pacific islands
▸ adjective: excluded from use or mention ("A taboo subject")
▸ Also see taboo