say it: DAHY-pur
diaper is a noun meaning "garment consisting of a folded cloth drawn up between the legs and fastened at the waist; worn by infants to catch excrement". It carries 2 recorded senses.
a fabric (usually cotton or linen) with a distinctive woven pattern of small repeated figures
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for diaper come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.