Modifier

['mɒdɪfaɪə] or ['mɑdə'faɪɚ]

(noun.) a gene that modifies the effect produced by another gene.

(noun.) a content word that qualifies the meaning of a noun or verb.

(noun.) a moderator who makes less extreme or uncompromising.

Checked by Barlow--From WordNet

(n.) One who, or that which, modifies.

Checked by Bianca