The Collaborative International Dictionary of English v.0.48:

Phosphatic \Phos*phat"ic\, a. (Chem.)
   Pertaining to, or containing, phosphorus, phosphoric acid, or
   phosphates; as, phosphatic nodules.
   [1913 Webster]

   Phosphatic diathesis (Med.), a habit of body which leads to
      the undue excretion of phosphates with the urine.
      [1913 Webster]