noun, noun which may take the genitive case particle 'no'
hermaphrodite; androgyny; hermaphroditism
Biological or medical term for an organism with both male and female reproductive organs; also used in a broader sense for androgyny. Often written in kana.
生物学の授業でふたなりについて学んだ。
I learned about hermaphroditism in biology class.
その植物はふたなりの特徴を持
That plant has hermaphroditic characteristics.
noun
hermaphroditic female characters
Manga/anime slang for female characters possessing both male and female sexual characteristics. Used primarily in otaku culture.
その漫画にはふたなりキャラが登場する。
That manga features hermaphroditic characters.
ふたなりジャンルの同人誌を買った。
I bought a doujinshi from the futanari genre.
Derived from 二つ (ふたつ, 'two') + 形 (なり, 'form, shape'), literally 'two forms'. The exact historical development is uncertain, but it has been used since classical Japanese to refer to beings with both male and female characteristics.