the word 'yarmulke' entered english from yiddish 'yarmlke'. yiddish acquired it from a slavic source, such as polish 'jarmułka' or ukrainian 'yarmulka', meaning 'cap'. the slavic terms are believed to be derived from turkic, possibly from a word like 'yağmurluk', which means 'rainwear', from 'yağmur' (rain). this etymological journey—from a practical turkic term for protection from the elements to a specific slavic and then yiddish term for a cap, and finally to its modern, specialized meaning in english for a jewish religious head covering—illustrates how a word's function can narrow and become culturally specific through borrowing. the phonetic adaptation through multiple languages has rendered its morphological structure opaque in english, making it a simplex loanword.

this word is a loanword from yiddish, which itself borrowed it from a slavic language (likely polish or ukrainian), ultimately tracing back to turkic origins. it is not productively formed from english or classical morphemes.