Definition of gum
the
tissue (covered by
mucous membrane) of the jaws that surrounds the bases of the
teeth
any of
various trees of the genera Eucalyptus or Liquidambar or Nyssa that are sources of gum
(verb)
cover, fill, fix or
smear with or as if with gum; "if you gum the
tape it is stronger"
exude or
form gum; "these trees gum in the Spring"