Home › Words › U › undermarkingsundermarkingsundermarkings means markings that appear on the underside of something. Usually used to describe an animal.EtymologyFrom under- + markings.nounMarkings that appear on the underside of something. Usually used to describe an animal.e.g.“Dr. Latham says, that the eggs are of a cinereous grey, whimsically marked with deep brownish black patches of irre gular sizes and shapes, besides some undermarkings of a dusky hue.” — 1812, British Zoology, volume 2, Wilkie and Robinson, page 145:Definitions & examples from Wiktionary (CC BY-SA 3.0).