Meaning of mordant

Definition of mordant

(adj) harshly ironic or sinister; "black humor"; "a grim joke"; "grim laughter"; "fun ranging from slapstick clowning ... to savage mordant wit"
of a substance, especially a strong acid; capable of destroying or eating away by chemical action
(noun) a substance used to treat leather or other materials before dyeing; aids in dyeing process

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