(1):

(p. pr. & vb. n.) of Boil

(2):

(a.) Heated to the point of bubbling; heaving with bubbles; in tumultuous agitation, as boiling liquid; surging; seething; swelling with heat, ardor, or passion.

(3):

(n.) The act of ebullition or of tumultuous agitation.

(4):

(n.) Exposure to the action of a hot liquid.