The Collaborative International Dictionary of English v.0.48:

Amniotic \Am`ni*ot"ic\, a. [Cf. F. amniotique.] (Anat.)
   Of or pertaining to the amnion; characterized by an amnion;
   as, the amniotic fluid; the amniotic sac.
   [1913 Webster]

   Amniotic acid. (Chem.) [R.] See Allantoin.
      [1913 Webster] Amoeba