bisexual
The origin and history of bisexual.
Etymology
From "bi-" ("two") plus "sexual". Originally an 18th-century botanical term for plants with both male and female parts; it took on its modern meaning about human sexuality in the late 1800s through early sexology writing.
Class of 1800
bisexual first entered the language around 1800. Other words from the same year:
See the full Class of 1800 →