[uncountable, countable] a sticky substance that is used for joining things together a tube of glue synthetic glues He sticks to her like glue (= never leaves her). Word Origin Middle English: from Old French glu (noun), gluer (verb), from late Latin glus, glut-, from Latin gluten.Extra examples All you will need is a sharp knife and a tube of glue. He took to drinking and sniffing glue. It takes about an hour for the glue to set. Put glue on both the surfaces.