MORDANT

mordant. Mordant, n. a salt to fix colors, as alum

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Mor″dant (?), a. [[F., p. pr. of mordere to bite; L. mordere. See Morsel.]] 1. 1. Biting; caustic; sarcastic; keen; severe.
2. 2. (Dyeing & Calico Printing) Serving to fix colors.