OD

OD is a both a word and a two letter abbreviation and can mean any of the following:

Non abbreviated meanings of OD

Od (also Oad, Oadki, Odki), a language of the Oad people
Od, a life force - see Odic force
Od, a Norse god - see Óðr
Od, a replacement for "God" in some minced oaths
od, a Unix program
od é uma palavra inventada pelos americanos que se significa ola tchau,etc.

Health and medicine

Doctor of Optometry (O.D.)
Occupational Disease, health effects from exposures associated with a particular occupation
Oculus dexter, a Latin term meaning "right eye" (oculus sinister means the left eye). Abbreviated OD and OS, these are most commonly used in ophthalmology and optometry. Ocularis dexter or ocular dexter means "pertaining to the right eye" and is also abbreviated OD.
omne in die - see "Once daily"
Once daily, a schedule for giving medication or other treatment, i.e. once per day (originally from the Latin omne in die)
Osteochondritis dissecans, a medical disease affecting the joints of both humans and animals
Overdose, typically consuming too much of a drug

Basic science

Oxygen Demand (biochemical, chemical, theoretical)
Optical Density (absorbance)

Other

O.D, a song by the British industrial band Sunna
O.D. (musician), a founding member of the Finnish industrial band Velcra
Object Desktop, a suite of skinning and customization programs by Stardock, or ObjectDock, another program by the same company
Oblivion Dust, a Japanese rock band
Odessa, TX, a small city in western Texas
Officer of the day
Official Dress in the popular agriculture club National FFA Organization
Old Derbeian, a former pupil of Derby School
Old Dolphin, a former pupil of Godolphin and Latymer School
Old Dragon, former pupil of the Dragon School
Olive Drab, as in OD Green
On-demand, describing a product or service which becomes available soon after being requested
One Day Match, a type of shorter match in cricket
Oneness Darkness, a Texas rock band
OpenDocument, the only ISO acknowledged standard document file format
Optical density, equivalent to absorbance
Order of Distinction, a civil honour of Jamaica
Ordnance Datum, a vertical datum used in Great Britain as the basis for deriving altitudes on maps
Organization development
Original dance, the second part of an ice dancing competition
Orphei Drängar, a Swedish male choir
Outside diameter, a dimension commonly used to specify the size of tubing or pipe
Pentium OverDrive, a brand of CPUs formerly produced by Intel

Translation

The word "OD" occurs as such in the following languages: English, Czech, German, French, Korean, Italian, Japanese, Norwegian (Bokmål), Norwegian (Nynorsk), Simple English, Chinese.

Translation(s) in other languages: Esperanto: Od, Ripuarian: OD (Watt ėßß datt?), Slovak: Od.