What is "ungummed"

Usage examples of "ungummed".

To Moist’s astonishment, it was already covered with stamps - ungummed, unperforated, but perfect miniature copies of his drawing for the one penny stamp.

He ungummed his eyes, found that he was looking up into the face of the mayor.

Once before, he had ungummed a whole sheet of stamps, and had paraded impudently around the apartment with an airmail stamp stuck on his nose.

The little envelope flap was ungummed, tucked in, and I pulled it out, took the little fold of pinkish-gray paper, and hesitated.