OD

I. noun Etymology: overdose Date: circa 1960 an overdose of a narcotic, one who has taken an ~, II. intransitive verb (~'d or ~ed; ~'ing; ~'s) Date: 1966 to become ill or die of an ~, to have or experience too much of something, III. abbreviation doctor of optometry, right eye, officer of the day, olive drab, on demand, outside diameter; outside dimension, overdraft; overdrawn