excipient

/EH0 K S IH1 P IY0 AH0 N T/
noun
  1. 1

    An ingredient that is intentionally added to a drug for purposes other than the therapeutic or diagnostic effect at the intended dosage.

  2. 2

    An exceptor.

adjective
  1. 1

    Taking an exception.

Source: https://en.wiktionary.org/wiki/excipient