tremor

Etymology

From Middle English tremour (“fright”), from Anglo-Norman tremour and Old French tremor, from Latin tremor.

noun

1. A shake, quiver, or vibration.
   She felt a tremor in her stomach before going on stage.
   1. A rhythmic, uncontrollable shaking of all or part of the body due to partial muscle contractions.
      The optometrist has been losing patients ever since he developed tremors in his hand.
2. An earthquake.
   Did you feel the tremor this morning?

verb

1. To shake or quiver excessively and rapidly or involuntarily; to tremble.
   The ground tremored under their big boots. 2004, Andrea Levy, chapter 17, in Small Island, London: Review, page 188