Definition of oto- in English:

oto-

Pronunciation: /ˈəʊtəʊ/

combining form

(Used chiefly in medical terms) of or relating to the ears: otoscope

Origin

from Greek ous, ōt- 'ear'.

Definition of oto- in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up