preclinical Syllabification: (pre·clin·i·cal)Pronunciation: /prēˈklinikəl/Definition of preclinical adjective Medicine relating to or denoting a stage preceding a clinical stage, in particular. relating to or denoting the first, chiefly theoretical, stage of a medical education:preclinical students relating to or denoting the stage in a disease prior to the appearance of symptoms that make a diagnosis possible. relating to or denoting the stage of drug testing that precedes the clinical stage. preclinical in other Oxford dictionaries Definition of preclinical in the British & World English dictionary