Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* rĕfervesco, fervi, 3, v. inch. n. [referveo], to boil or bubble up: qui (sanguis) refervescere videretur sic, ut tota domus sanguine redundaret, Cic. Div. 1, 23, 46.