Etymology
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tonic (adj.)
1640s, "relating to or characterized by muscular tension," from Greek tonikos "of stretching," from tonos "a stretching," from PIE root *ten- "to stretch." The meaning "maintaining the healthy firmness of tissues" is recorded from 1680s, first extended 1756 to "having the property of restoring to health." Related: Tonical (1580s).
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tonsorial (adj.)
"pertaining to barbers," 1765, from -al (1) + Latin tonsorius "of or pertaining to shearing or shaving," from tonsor "a shaver, barber, shearer, clipper," from tonsus, past participle of tondere "to shear, shave, clip, crop," from PIE *tend-, from root *tem- "to cut." Generally used in an attempt at humor. Tonsorious in the same sense is attested from 1650s.
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tonight (adv.)
Old English toniht "in the coming night," from to "at, on" (see to) + niht (see night). As a noun, "in the night after the present day," early 14c. Written as two words until 18c., after which it was to-night until early 20c.
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Tony 
1947, awards given by American Theatre Wing (New York), from nickname of U.S. actress, manager, and producer Antoinette Perry (1888-1946).
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tonal (adj.)
1776; from tone (n.) in the musical sense + -al (1), or from Medieval Latin tonalis.
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tonsillitis (n.)
also tonsilitis, "inflammation of the tonsils," 1801, from combining form of tonsil + -itis "inflammation."
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tonneau (n.)
1901, rear part of an automobile, from French tonneau, literally "cask, tun" (see tun).
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tonic (n.2)
in the musical sense, 1760, short for tonic note, from tone (n.) in the musical sense + -ic. Related: Tonicity.
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tongue-twister (n.)
1875, in reference to an awkward sentence, 1892 of a deliberately difficult-to-say phrase, from tongue (n.) + agent noun from twist (v.). The first one called by the name is "Miss Smith's fish-sauce shop."
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