empirical
     adj 1: 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" [syn: {empiric}]
            [ant: {theoretical}]
     2: relying on medical quackery; "empiric treatment" [syn: {empiric}]
Source: WordNet® 2.0