verb (used with or without object), liq·ue·fied, liq·ue·fy·ing.
- to make or become liquid.
verb -fies, -fying or -fied
- (esp of a gas) to become or cause to become liquid
early 15c., from Old French liquefier “liquefy, dissolve,” from Latin liquefacere “make liquid, melt,” from liquere “be fluid” (see liquid (adj.)) + facere “to make” (see factitious).