plural of earth tremor

plural of night tremor

plural of essential tremor

plural of harmonic tremor

(geology) A small earthquake, or seismic event.

(geology) A rhythmic shaking of the ground detectable by a seismograph, and associated with volcanic activity. Often a symptomatic warning of an eruption.

A night terror.

(medicine, chiefly uncountable) A neurological condition that causes rhythmic shaking of unknown cause in one or more parts of the body during voluntary movements.