A device that emits a dense vapour that appears similar to fog or smoke, used in theatre, film and other applications.

(idiomatic, humorous or euphemistic) An expression of surprise.

The angle at which shock waves separate from an object travelling supersonically. The angle is related to the Mach number of the supersonic object.

A device used to verify the mechanical laws of motion with constant acceleration, consisting of two objects of known masses connected by a string over a pulley.

plural of Mach band

Any of a series of bands of slightly different shades of grey that make up an optical illusion where the contrast between the bands appears to be exaggerated as soon as they contact one another.

Alternative letter-case form of Mach.

plural of Mach diamond

Synonym of shock diamond

Initialism of former Yugoslav Republic of Macedonia, former official name of Northern Macedonia.