SE'ALER, n. 1. One who seals; an officer in chancery who seals writs and instruments. 2. In New England, an officer appointed by the town or other proper authority, to examine and try weithts and measures, and set a stamp on such as are according to the standards established by the state; also, an officer who inspects lether and stamps such as is good. These are called sealers of weights and measures, and sealers of lethers.