Incisive and trenchant: an inquisitor's mordant questioning.
Bitingly painful.
Serving to fix colors in dyeing.
n.
A reagent, such as tannic acid, that fixes dyes to cells, tissues, or textiles or other materials.
A corrosive substance, such as an acid, used in etching.
tr.v.
mor·dant·ed, mor·dant·ing, mor·dants To treat with a mordant.
[French, from Old French, present participle of mordre, to bite, from Vulgar Latin *mordere, from Latin mordēre; see mer- in Indo-European roots.] mor'dan·cy n., mor'dant·ly adv.