ˈmädəˌfī(ə)r, -īə noun
( -s )
1. : one that modifies
2.
a. : a grammatical qualifier : a subordinate constituent of a grammatical construction
b. : a phonetic symbol of defined meaning that alters the value or provides a more exact description of the symbol to which it is attached (as n in ä n representing a nasalized ä) : diacritic
3.
a. : a gene known only by its effect on the expression of another gene occupying a different locus
b. : a gene that modifies the effect of another
4. : a substance added during a process or operation to bring about a desired effect or impart desired qualities (as in polymerization processes for controlling cross-linking or in ore flotation for decreasing the tendency of flotation of the undesired particles of gangue)