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OTO
++/-- One Time Only
/---- otolaryngology
/---- otology
AcroLexic: Dictionary of Acronyms and Abbreviations contains 1 more definition of “OTO”.
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See also

Acronym Definitions
LVOTO 5
PHOTO 3
PHOTOM 2
NOTOX 2
TOTO 2
OTOOH 1
OTOH 1
HOTOL 1