WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. of or relating to a disease (or anything resembling a disease) constantly present to greater or lesser extent in a particular locality
Word Usage
"When the weather breaks many fall sick, this being the time of an endemical sickness, for seasonings, cachexes, fluxes, scorbutical dropsies, gripes, or the like which I have attributed to this reason."