Definitions
1.nounAny substance used to facilitate the fixing of a dye to a fibre; usually a metallic compound which reacts with the dye using chelation.
2.nounAny corrosive substance used in etching.
3.nounA glutinous size used as a ground for gilding, to make the gold leaf adhere.
4.verbTo subject to the action of, or imbue with, a mordant."Mordant these goods for dyeing."
5.adjectiveHaving or showing a sharp or critical quality
6.adjectiveServing to fix a dye to a fibre.