cathairEtymologyFrom cat + hair.nounThe hair of a cat.“How can you tell a cat owner? all the little claw marks on their back...Or by the cathair that sticks to their suit.”A single hair of a cat.“A pimpled chin, dark with cathairs, a mouthful of irregular teeth, were visible below helmet and goggles.”An ancient Irish fortification of stone or earthwork.“Several cathairs which we have examined are not circular in plan, but appear to have been formed to suit the contour of the eminence upon which they stand; and others are of an oval form.”