(D.Eng. nosu, cf. Dutch news, Swed. nos, snout; the connexion with O.Eng. nasu is obscure, cf. Ger. Nase, Lat. nares, nostrils, nasus, nose, Fr. nez), the organ of the sense of smell in man and other animals (see Olfactory System). The projecting feature above the mouth, to which the word is usually restricted in man, is, in the case of the lower animals, called snout or muzzle, or, if much prolonged, proboscis or trunk. "Nostril," the external opening into the nose, is from O.Eng. nosthyrl (thyrl or th y rl, hole or opening).