- tremor, shudder - an involuntary vibration (as if from illness or fear)
--1 is a kind of vibration, quiver, quivering
- tremor, earth tremor, microseism - a small earthquake
--2 is a kind of earthquake, quake, temblor, seism
--2 has particulars: aftershock; foreshockDerived form: verb tremor1 - tremor - shaking or trembling (usually resulting from weakness or stress or disease)
--3 is a kind of shaking, shakiness, trembling, quiver, quivering, vibration, palpitation
--3 is a part of
--3 has particulars: essential tremorparalysis agitans, Parkinsonism, Parkinson's disease, Parkinson's syndrome, Parkinson's, shaking palsy