8 letters · 17 points in Scrabble
noun a person who is sexually attracted to both sexes
adjective sexually attracted to both sexes
adjective having an ambiguous sexual identity
originFrom bi- + -sexual, via the French bisexuel (bi-, sexuel). Attested since 1792 as a synonym in botany for "hermaphroditic" ("having male and female parts"). First used of sexuality in Richard von Krafft-Ebing's 1886 Psychopathia Sexualis (in German) and Charles Gilbert Chaddock's 1892 English translation thereof, due to the theory that people were naturally attracted to the opposite sex and so…
Etymology from Wiktionary, CC BY-SA 3.0