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od

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noun pl. od

a hypothesized force in nature formerly thought to manifest itself in such phenomena as hypnotism, magnetism, light, etc.

Related Forms:

odic adjective

or 'Od

interjection

Archaic used as a mild oath

noun pl. ODs or OD's

an overdose, esp. of a narcotic

intransitive verb OD'd or ODed, OD'ing or ODing

to take an overdose, esp. a fatal overdose of a narcotic

Doctor of Optometry
also O.D.
Officer of the Day
olive drab
outside diameter

Also, for OD & , od

See od in American Heritage Dictionary 4

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OD (abbreviation)