Merriam-Webster Collegiate Dictionary - od

 I. noun  Etymology: overdose  Date: circa 1960  1. an overdose of a narcotic  2. one who has taken an ~  II. intransitive verb  (~'d or ~ed; ~'ing; ~'s)  Date: 1966  1. to become ill or die of an ~  2. to have or experience too much of something — usually used with on ~ on television  III. abbreviation  1. doctor of optometry  2. Latin oculus dexter right eye  3. officer of the day  4. olive drab  5. on demand  6. outside diameter; outside dimension  7. overdraft; overdrawn OD  or ~d  interjection  Usage: often capitalized  Etymology: euphemism for G~  Date: 1695 archaic — used as a mild oath