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substitutive
substrate
substratosphere
substratum
substructure
subsume
subsumption
subtangent
subtenant
subtend
subterfuge
subterminal
subterranean
subtext
subtidal
subtilise
subtilisin
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substituent

sub·stit·u·ent [ səb stíchoo ənt ] (plural sub·stit·u·ents)


noun 
Definition:
 
replacement atom or atoms: an atom or group of atoms that replaces another atom or group in a molecule

[Late 19th century. < Latin substituent-, present participle of substituere "set up under" (see substitute)]
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