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The Collaborative International Dictionary
Rhino-

Rhino- \Rhi"no-\ A combining form from Greek ??, ???, the nose, as in rhinolith, rhinology.

Douglas Harper's Etymology Dictionary
rhino-

before vowels rhin-, word-forming element meaning "nose, of the nose," from Greek rhino-, comb. form of rhis "nose," which is of uncertain origin.

Wiktionary
rhino-

pre. Of the nose.