WordReference Random House Unabridged Dictionary of American English © 2020
derived unit, 
  • Chemistry, Physics(in physics, chemistry, etc.) a unit derived from fundamental units of length, mass, and time.

  • Collins Concise English Dictionary © HarperCollins Publishers::
    derived unit n
    1. a unit of measurement obtained by multiplication or division of the base units of a system without the introduction of numerical factors

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