[Latin ēbulliēns, ēbullient-, present participle of ēbullīre, to bubble up : ē-, ex-, up, out; see ex- + bullīre, to bubble, boil.] e·bul'lient·ly adv.
1599, "boiling," from L. ebullientem, prp. of ebullire "to spout out, burst out," from ex- "out" + bullire "to bubble" (see boil (v.)). Figurative sense of "enthusiastic" is first recorded 1664.