Stamp gum that adheres to envelope paper by the application of pressure alone. Most self-adhesive stamps are sold on a coated paper release liner. See also Liner, Linerless, Water-activated.
Stamp printed on specially gummed paper that will adhere directly to envelope without moistening. The stamps are thus sold attached to backing paper, which can be peeled, from the self-adhesive paper for attachment to mail. Such stamps are normally produced in booklets or rolls.
Gummed stamps (with protective backing) which do not require moistening.