monorhinal
/ˌmɒnə(ʊ)ˈrʌɪnl/adjective
1 Zoology. Having a single central nasal passage, as characteristic of some agnathan vertebrates.
2 Physiology. Involving or relating to the use of only one nostril.
Origin
Late 19th century; earliest use found in The Century Dictionary. From mono- + -rhinal, in sense 1 after monorhine or its etymon scientific Latin Monorrhina.