older term for psychogenic tremor.
Etymology: Gk, hystera, womb; L, tremere, to tremble
1 a fine rhythmic shaking in one extremity or of a generalized nature that may be an expression of fear, anxiety, or hysteria.
2 a coarse, irregular shaking that increases with voluntary movements.
3 a shaking that is transient and is caused by exposure to drugs or toxic substances rather than an organic disorder.