(physics, analytical chemistry) An analytical technique that measures the mass / charge ratio of the ions formed when a molecule or atom is ionized, vaporized and introduced into a vacuum. Mass spectrometry may also involve breaking molecules into fragments - thus enabling its structure to be determined.

An online computer role-playing game in which a large number of players can interact with one another.

A skilled and experienced tradesman, especially one who has submitted a masterpiece to his guild.

A plaster or similar cast of a person's face after death.

Collectively, the communications media, especially television, radio, and newspapers, that reach the mass of the people.

Having no mass.

Heavy; massive.

Pronunciation spelling of mercy.

Pronunciation spelling of master.

Something thought to bring good luck. / Something, especially a person or animal, used to symbolize a sports team, company, organization or other group.