congeal (v.)

late 14c., congelen, from Old French congeler (14c.) "to freeze, thicken," from Latin congelare "to cause to freeze, to freeze together," from assimilated form of com "with, together" (see con-) + gelare "to freeze," from gelu "frost, ice" (from PIE root *gel- "cold; to freeze"). Related: Congealed; congealing; congealment.