adjective Medicine/Medical.
of or pertaining to the period prior to the appearance of the symptoms.

1930–35; pre- + clinical

preclinically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
preclinical (priːˈklɪnɪkəl)
1.  of, relating to, or occurring during the early phases of a disease before accurate diagnosis is possible
2.  of, relating to, or designating an early period of scientific study by a medical student before practical experience with patients

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

preclinical pre·clin·i·cal (prē-klĭn'ĭ-kəl)

  1. Of or relating to the period of a disease before the appearance of symptoms.

  2. Of or being a period in medical education before the student is involved with patients and clinical work.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The device, which is in preclinical tests in mice, can be implanted in inoperable tumors during a routine biopsy.
He also has significant experience in preclinical and clinical development.
Preclinical research suggests that these cells induce growth of new cells in heart muscle.
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