An Etymological Dictionary of Astronomy and Astrophysics
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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.

→ transverse; → mass.