Definition of glue

• n. - A hard brittle brownish gelatin, obtained by boiling to a jelly the skins, hoofs, etc., of animals. When gently heated with water, it becomes viscid and tenaceous, and is used as a cement for uniting substances. The name is also given to other adhesive or viscous substances.
• n. - To join with glue or a viscous substance; to cause to stick or hold fast, as if with glue; to fix or fasten.