List of medical abbreviations: Latin abbreviations - Wikipedia
https://en.wikipedia.org/wiki/List_of_medical_abbreviations:_Latin_abbreviations
Webqhs, h.s., hs at bedtime or half strength quaque hora somni ii two tablets duos doses iii three tablets trēs doses n.p.o., npo, NPO nothing by mouth / not by oral administration: nil per os o.d., od, OD right eye. once a day (United Kingdom) oculus dexter omne in die o.s., os, OS left eye: oculus sinister o.u., ou, OU both eyes: oculus uterque ...
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