The output of a mass spectrometer

A direct action event in which bicycle riders travel through city streets as a group.

plural of mass murderer

sacring-bell

plural of mass spectrograph

(physics, analytical chemistry) A mass spectrometer

(psychology) The sociopsychological phenomenon in which a large group of people exhibit the same or similar hysterical symptoms simultaneously.

(law) Abbreviation of United States District Court for the District of Massachusetts, as used in case citations.

(astronomy) A unit of mass equal to the mass of the planet Jupiter, used to express the mass of other planets. 1 M_J = 2 × 10²⁷ kg.

(astronomy) A unit of mass equal to that of the Earth, used to express the mass of other planets etc. 1 M_🜨 = 6 × 10²⁴ kg.