fm -abbr

  1. fathom

Fm -symbol

  1. fermium

FM ['ef-,em] -n

  1. a broadcasting system using frequency modulation
  2. a radio receiver of such a system
  3. field manual

FMN [,ef-,em-'en] -n

  1. a yellow crystalline phosphoric ester C 17H 21N 4O 9P of riboflavin that is a coenzyme of several flavoprotein enzymes

fMRI -abbr

  1. functional magnetic resonance imaging