diaper

The word 'diaper' entered English in the 14th century from the Old French 'diapre', meaning a costly, patterned cloth. This French term derived from Medieval Latin 'diasprum', which itself came from the Byzantine Greek 'diaspros', meaning 'pure white' or 'shining through'. The original Greek term was a compound of 'dia-' (through) and 'aspros' (white), referring to a fine, white linen cloth. The modern meaning evolved from the specific type of cloth used for toweling and napkins to its specialized application for infants in the 19th century, focusing on its absorbent function rather than its decorative pattern.

The word 'diaper' is a simplex loanword from Old French. It does not contain separable, meaningful morphemes within its modern English spelling.