Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
suf-fervēfăcĭo (subf-), no perf., factum, 3, v. a., to heat or warm from below (Plinian), Plin. 18, 11, 26, § 104: affirmant, lapillos, qui sufferveflant, rumpi, id. 27, 9, 51, § 75: aceti heminis quinque suffervefactis, id. 14, 17, 21, § 114: semuncia amyli cum ovo, id. 22, 25, 67, § 137; 37, 10, 54, § 142.