(astronomy) Synonym of asteroid belt; the main asteroid belt in the Solar System located roughly between the orbits of the planets Mars and Jupiter.

(nautical, military) The primary belt of armor protecting the sides of a warship above and slightly below the waterline.

plural of maiden run

(of a locomotive, train, etc.) Its first trip in service, in some cases after a rebuild.

plural of main sequence

(CB radio slang) To listen to CB radio conversations without taking part. / Used other than figuratively or idiomatically: see read, mail.

A suburban village in the Metropolitan Borough of North Tyneside, Tyne and Wear, England (OS grid ref NZ3367).

Alternative form of snail mail.

(games) Describing a game that can be played in a turn-based fashion through postal mail or email.

(games) A play-by-mail game.