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monorhinous

or mon·o·rhi·nal

[mon-uh-rahy-nuh s or mon-uh-rahyn-l]
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adjective Zoology.
  1. having a single, median nostril, as the cyclostomes.
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Also mon·o·rhine [mon-uh-rahyn] /ˈmɒn əˌraɪn/.

Origin of monorhinous

1900–05; mono- + -rhinous < Greek -rhinos -nosed, adj. derivative of rhīs, stem rhin- nose; see -ous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018