(crime) The shooting of multiple people over a short period of time, particularly when there are many victims and/or the victims are chosen indiscriminately.

plural of posture-master

(archaic) One who teaches or practices artificial postures of the body: an acrobat.

(physics, chemistry) Synonym of conservation of mass

(television) A plate punched with tiny holes that separate the coloured phosphors in the layer behind the front glass of the screen. Three electron guns at the back of the screen sweep across the mask, with the beams only reaching the screen if they pass through the holes.

Alternative form of workmaster

plural of work-master

A person who is adept at overseeing the construction a building using the plans drawn by an architect

Alternative spelling of Old Master

plural of massage chair