A<unk>  (or naris, pl. nares) is one of the two channels of the nose, from the point where they bifurcate to the external opening. In birds and mammals, they contain branched bones or cartilages called turbinates, whose function is to warm air on inhalation and remove moisture on exhalation. Fish do not breathe through their noses, but they do have two small holes used for smelling which may be called<unk> s.
In humans, the nasal cycle is the normal ultradian cycle of each<unk> 's blood vessels becoming engorged in swelling, then shrinking. During the course of a day, they will switch over approximately every four hours or so, meaning that only one<unk>  is used at any one time.
Nostril
Ramipril
Spirapril
Isosorbide dinitrate
Iofendylate
Delapril
Captopril
Minoxidil 