suppressor

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Related to suppresser: suppresser gene

sup·pres·sor

(sū-pres'ŏr),
A compound that suppresses the effects of mutation or suppresses what would be a normal course of events.

suppressor

(sə-prĕs′ər)
n.
1. or suppresser One that suppresses: a suppressor of free speech.
2. A gene that suppresses the phenotypic expression of another gene, especially of a mutant gene.