"foaming, frothing," 1856, from Latin spumescentem (nominative spumescens), present participle of spumescere "grow frothy," from spuma (see spume) + inchoative suffix -escere.
Entries linking to spumescent
spume n.
late 14c., from Old French spume, from Latin spuma "foam" (also source of Italian spuma, Spanish espuma); cognate with Old English fam, Old High German veim "foam" (see foam (n.)).