glue

Short definition from Wiktionary

Noun

1. 1
   A hard gelatin made by boiling bones and hides, used in solution as an adhesive; or any sticky adhesive substance.
2. 2
   Anything that binds two things or people together.
3. 3
   A viscid secretion on the surface of certain plants.

Verb

1. 1
   To join or attach something using glue.
2. 2
   To cause something to adhere closely to; to cause to follow attentively.
3. 3
   To apply glue.