An Etymological Dictionary of Astronomy and Astrophysics

In special relativity theory, the mass when the acceleration of a body is perpendicular to its velocity:

m_t = m₀ / [1 - (v/c)²]^1/2,
where m₀ is the → rest mass, v is the velocity, and c the → velocity of light. The transverse mass is identical to the → relativistic mass. See also → longitudinal mass.

See also: → transverse; → mass.