When a liquid congeals, it becomes very thick and sticky and almost solid. The blood had started to congeal. spilled wine mingled with congealed soup. if a liquid such as blood congeals, it becomes thick or solid (congeler, from congelare, from com- ( COM-) + gelare )
[ k&n-'jE(&)l ] (verb.) 14th century. Middle English congelen, from Middle French congeler, from Latin congelare, from com- + gelare to freeze; more at COLD.