endobiotic

/EH0 N D OW0 B IY0 AA1 T IH0 K/
adjective
  1. 1

    (of a parasite or symbiont) living within the tissues of a host.

  2. 2

    (medicine) Originating within an organ or biological system.

noun
  1. 1

    (medicine) An endogenous substance that influences the functioning of an organ or biological process.