English

kidult

Blend of kid + adult.

A blend of kid + adult

Proto-Germanic *kidją ‘goatling’

Old Norse kið ‘young goat’

Middle English kide ‘kid’

English kid

Proto-Indo-European *h₂el- ‘to grow’

…

Latin olēscō ‘to grow’

Latin adolescō ‘to grow up’

Latin adultus ‘grown up’

French adulte

English adult

Today it means

noun An adult who participates in youth culture and activities traditionally intended for children.

Language periods are conventional ranges, not dates for this word.