spumescent (adj.)youdaoicibaDictYouDict[spumescent 词源字典]
"foaming, frothing," 1856, from Latin spumescentem (nominative spumescens), present participle of spumescere "grow frothy," from spuma (see spume) + inchoative suffix -escere.[spumescent etymology, spumescent origin, 英语词源]