Source : Webster's Revised Unabridged Dictionary (1913)

Excipient \Ex*cip"i*ent\, n.
   1. An exceptor. [R.]

   2. (Med.) An inert or slightly active substance used in
      preparing remedies as a vehicle or medium of
      administration for the medicinal agents. --Chambers.

Excipient \Ex*cip"i*ent\, a. [L. excipients, -entis, p. pr. of
   exipere. See {Except}, v. t.]
   Taking an exception.