Dictionary.com
definitions

subclinical

[suhb-klin-i-kuh l]

adjective Medicine/Medical.

pertaining to an early stage of a disease; having no noticeable clinical symptoms.

Origin of subclinical

First recorded in 1930–35; sub- + clinical
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for subclinical

subclinical

adjective

med of or relating to the stage in the course of a disease before the symptoms are first noted
Derived Formssubclinically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
subclinical in Medicine

subclinical

[sŭb-klĭn′ĭ-kəl]

adj.

Not manifesting characteristic clinical symptoms. Used of a disease or condition.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.