Empiric

n.
  1. One who follows an empirical method; one who relies upon practical experience.
  2. One who confines himself to applying the results of mere experience or his own observation; especially, in medicine, one who deviates from the rules of science and regular practice; an ignorant and unlicensed pretender; a quack; a charlatan.

a.
  1. Pertaining to, or founded upon, experiment or experience; depending upon the observation of phenomena; versed in experiments.
  2. Depending upon experience or observation alone, without due regard to science and theory; -- said especially of medical practice, remedies, etc.; wanting in science and deep insight; as, empiric skill, remedies.
  3. Empirical formula . (Chem.)
    See under Formula.