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say it: THUHN-dur
thunder is a verb and noun meaning "move fast, noisily, and heavily". It is pronounced /ˈθʌndɚ/ — THUHN-dur. It carries 7 recorded senses.
be the case that thunder is being heard
“Whenever it thunders, my dog crawls under the bed”
to make or produce a loud noise
“The river thundered below”
“The engine roared as the driver pushed the car to full throttle”
a booming or crashing noise caused by air expanding along the path of a bolt of lightning
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 thunder 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.