Glabrousness
Glabrousness (from Latin glaber 'bald, hairless, shaved, smooth, etc.') is the technical term for a lack of hair, down, setae, trichomes, or other such covering. A glabrous surface may be a natural characteristic of all or part of a plant or animal, or be due to loss because of a physical condition, such as alopecia universalis in humans, which causes hair to fall out or not regrow.