From The Collaborative International Dictionary of English v.0.48 :
Rhinal \Rhi"nal\, a. [Gr???, ???, the nose.] (Anat.)
Og or pertaining to the nose or olfactory organs.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
rhinal
adj 1: of or in or relating to the nose; "nasal passages" [syn:
rhinal, nasal]