Read the dictionary definition of mordant. All definitions for this word.
1. a substance used to treat leather or other materials before dyeing; aids in dyeing process
2. of a substance, especially a strong acid; capable of destroying or eating away by chemical action
3. harshly ironic or sinister
1. black humor
2. a grim joke
3. grim laughter
4. fun ranging from slapstick clowning ... to savage mordant wit