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trem·ble (trĕmbəl)
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intr.v. trem·bled, trem·bling, trem·bles
1. To shake involuntarily, as from excitement or anger; quake. See Synonyms at shake.
2. To feel fear or anxiety: I tremble at the very thought of it.
3. To vibrate or quiver: leaves trembling in the breeze.
n.
1. The act or state of trembling.
2. trembles A convulsive fit of shaking. Used with the.
3. trembles (used with a sing. verb)
a. Poisoning of domestic animals, especially cattle and sheep, caused by eating white snakeroot or the composite plant Isocoma pluriflora of the southwest United States and northern Mexico, and characterized by muscular tremors and weakening. Also called milk sickness.
b. Any of several other animal diseases characterized by trembling, such as louping ill.

[Middle English tremblen, from Old French trembler, from Vulgar Latin *tremulāre, from Latin tremulus, trembling; see TREMULOUS.]

trembler n.
trembling·ly adv.
trembly adj.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.