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say it: DIF-thawng
diphthong is a noun meaning "a vowel sound that starts near the articulatory position for one vowel and moves toward the position for another". It carries one recorded sense.
a vowel sound that starts near the articulatory position for one vowel and moves toward the position for another
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 diphthong 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.