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say it: SAH-nik
sonic is an adjective meaning "(of speed) having or caused by speed approximately equal to that of sound in air at sea level". It carries 2 recorded senses.
(of speed) having or caused by speed approximately equal to that of sound in air at sea level
“a sonic boom”
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 sonic 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.