Hypertext Webster Gateway: "substituent"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Substituent \Sub*stit"u*ent\, n. [L. substituens, p. pr. See
{Substitute}.] (Chem.)
Any atom, group, or radical substituted for another, or
entering a molecule in place of some other part which is
removed.
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