A stamp affixed to envelopes by means of gum on the reverse. Some stamps are printed directly onto postcards, envelopes or wrappers. See Postal Stationery.

A gummed stamp made to be attached to mail.

A gummed stamp  Albino Omission of colour from a stamp giving a colourless impression of the design  Aniline A stamp printed with a fugitive ink or dye

1) The gum on the back of a stamp or label. Some stamps have been issued with no adhesive. Stamp adhesive may be water-activated or pressure-sensitive (self-adhesive). 2) A word generally referring to a stamp that may be affixed to an article to prepay postal fees, in contrast to a design printed directly on an article, as with postal stationery. An adhesive can also refer to a registration label or other label added to a cover.

A postage stamp intended for affixing on letters and other mail.

The term refers to the moisture sensitive gum (and now pressure sensitive ahesives) applied to stamps. It is often used to distinguish stamps to be glued on letters from pre-printed postal stationery.