say it: muh-THAHY-uhs
mathias is a noun meaning "United States athlete who won Olympic gold medals in the decathlon (born in 1930)". It carries one recorded sense.
United States athlete who won Olympic gold medals in the decathlon (born in 1930)
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 mathias 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.