1. mystacial - Noun
2. mystacial - Adjective
Having a fringe of hairs suggestive of a moustache.
Pertaining to the area around the vibrissae on either side of the muzzle of a mammal such as a rodent or cat.
mystacial (plural mystacials)
Any of the large rigid whiskers (vibrissae) that appear on the fleshy pads on either side of the muzzle of an animal such as a cat or rodent.
During the third week, the mystacials and ulnarcarpals are the first to form.