rem Meaning, Definition & Usage

  1. noun a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep
    rapid eye movement sleep; rapid eye movement; paradoxical sleep; REM sleep.
  2. noun (Roentgen Equivalent Man) the dosage of ionizing radiation that will cause the same amount of injury to human tissue as 1 roentgen of X-rays

WordNet

Re*m, er"cie, Re*mer"cy transitive verb (Also<
  • Rem
  • ercie
  • Remercy
)
Etymology
F. remercier; pref. re- re- + OF. mercier to thank, from OF. & F. merci. See Mercy.
Definitions
  1. To thank. Obs.
    She him remercied as the patron of her life. Spenser.

Webster 1913