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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.
ambulacrum is a noun meaning "one of the five areas on the undersurface of an echinoderm on which the tube feet are located". It carries one recorded sense.
one of the five areas on the undersurface of an echinoderm on which the tube feet are located
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 ambulacrum come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.