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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
sunstroke is a noun meaning "sudden prostration due to exposure to the sun or excessive heat". It carries one recorded sense.
sudden prostration due to exposure to the sun or excessive heat
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 sunstroke come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.