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substituent
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| substitutable
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substituent
CIDE DICTIONARY
substituent, n. [L. substituens, p. pr. See Substitute.].
Any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed. [1913 Webster]
OXFORD DICTIONARY
substituent, adj. & n. Chem.
--adj. (of a group of atoms) replacing another atom or group in a compound.
--n. such a group.
--adj. (of a group of atoms) replacing another atom or group in a compound.
--n. such a group.
Etymology
L substituere substituent- (as SUBSTITUTE)
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