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Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
machmeter is a noun meaning "speedometer for measuring the speed of an aircraft relative to the speed of sound". It carries one recorded sense.
speedometer for measuring the speed of an aircraft relative to the speed of sound
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 machmeter come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.