[trem.or] n [ME tremour terror, fr. MF, fr. L tremor trembling, fr. tremere] (1615) 1: a trembling or shaking usu. from physical weakness, emotional stress, or disease
2: a quivering or vibratory motion; esp: a discrete small movement following or preceding a major seismic event 3 a: a feeling of uncertainty or insecurity b: a cause of such a feeling