o/d

od «od, ohd», noun.

an imaginary force formerly believed to pervade all nature and to manifest itself in magnetism, mesmerism, chemical action, and other effects.

╂[< German Od, coined by Baron Karl von Reichenbach, 1788-1869, a German naturalist]

OD «OH DEE», noun, plural OD's or ODs, verb, OD'd, OD'ing. Slang.

–n.

1. an overdose of a narcotic.

2. a person who has taken such an overdose: »

“When I was shooting up…I liked to hear about the ODs, and I'd think I was brave for taking it” (Time).

–v.i.

to become sick or die from an overdose of a narcotic.

o/d (no periods),

Banking. a) overdraft. b) overdrawn.

o.d.,

an abbreviation for the following:

1. olive drab (uniform).

2. on demand.

3. on duty.

4. outside diameter.

5. outside dimension.

O.D. or OD (no periods),

an abbreviation for the following:

1. officer of the day.

2. olive drab (uniform).

3. ordinary seaman.

4. Banking. a) overdraft; b) overdrawn.

5. Doctor of Optometry.