Empiric

One who follows an empirical method; one who relies upon practical experience.

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.

Alt. of Empirical

derived from experiment and observation rather than theory; "an empirical basis for an ethical theory"; "empirical laws"; "empirical data"; "an empirical treatment of a disease about which little is known"