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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.
Related entries & more 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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tonneau (n.)1901, rear part of an automobile, from French tonneau, literally "cask, tun" (see tun).
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