noun

diaper

nappy

The baby needs a new diaper.

The baby needs a new nappy.

She packed extra diapers for the trip.

She packed extra nappies for the trip.

((a/an)) diaper a piece of absorbent material worn by a baby The baby needs a new diaper.

Synonyms: nappy (UK English)

From Middle English 'diaper', meaning a white patterned cloth, from Old French 'diaspre'.

In American English, it's a 'diaper'; in British English, it's a 'nappy'. Remember the difference when traveling.

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