from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of or relating to the period of a disease before the appearance of symptoms.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Describing the period of a disease before any symptoms appear
- adj. Describing a test or trial of a new pharmaceutical on animals (or in vitro) rather than on humans
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. of or relating to the early phases of a disease when accurate diagnosis is not possible because symptoms of the disease have not yet appeared
pre- + clinical (Wiktionary)