pee

The word 'pee' is a euphemistic slang term originating in the late 18th century from the first letter of the word 'piss'. It represents a common pattern in English where the initial letter of a taboo or vulgar term is used to create a more socially acceptable, often childish, alternative. The process of forming words from the initial letters of other words is a type of abbreviation. Over time, 'pee' became fully lexicalized as both a verb and a noun, shedding its overt connection to its source for most speakers and entering standard informal usage.

This word is a simplex form, a euphemistic abbreviation. It is not productively formed from separable morphemes in modern English.