- o.d.⇄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.⇄O.D. orOD(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.