This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A shaking or vibrating movement, as of the earth.

n. A trembling or quivering effect: a tremor of aspen leaves.

n. An involuntary trembling or quivering, as from nervous agitation or weakness.

n. A nervous quiver or thrill: felt a tremor of joy.

n. A state or feeling of nervous agitation or tension.

n. A tremulous sound; a quaver.

n. A shake, quiver, or vibration.

n. An earthquake.

v. To shake or quiver excessively and rapidly or involuntarily; to tremble.

n. A trembling; a shivering or shaking; a quivering or vibratory motion.

n. In colonial furniture, a sort of hood or head-piece found on high cupboards and the like: probably derived from a French type.

n. A shaking or quivering caused by some external impulse; a close succession of short vibratory or modulatory movements; a state of trembling in a living object or substance: as, the tremor of the aspen-leaf.

n. An involuntary or convulsive muscular shaking, quaking, or quivering, as from weakness, disorder, or emotion.

n. A trembling, quivering, or quavering quality or effect: as, a tremor of light.

n. Synonyms Trepidation, Emotion, etc. (see agitation), quiver, quivering, quaking. See trepidation.

n. an involuntary vibration (as if from illness or fear)

v. shake with seismic vibrations

n. shaking or trembling (usually resulting from weakness or stress or disease)

n. a small earthquake

"When severe, this withdrawal is characterized by tremor, restlessness, perceptual disturbances, disorientation, and clouded sensorium."

quivering    quiver    vibration    shake    agitate   

tremor cordis    neural tremors    metallic tremor    purring tremor    mercurial tremor    intention tremor   

tremble    tremblor   

tremorous    tremorously   

trembling    tremble    vibration   

emmer    gemmer    hemmer    stemmer   

shiver    spasm    twinge    quiver    throb    flicker    flutter    jolt    ache    gasp