资料来源 : pyDict

取代

资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.