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orthodontics (n.)
Related entries & more "orthodontia, the branch of dentistry concerned with the treatment of irregularities of the teeth and jaws," 1909, from orthodontic (adj.); also see -ics.
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rinse (n.)
Related entries & more "a light washing; a renewed application of water to remove residue from a former washing," 1837, from rinse (v.). As a hair treatment, by 1928. An earlier noun was Middle English rincinge (c. 1300).
tract (n.2)"little book, treatise" mid-12c., probably a shortened form of Latin tractatus "a handling, treatise, treatment," from tractare "to handle" (see treat (v.)). Related: Tractarian.
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