od

1. (pseudoscience, historical, also attributive) A hypothetical force or natural power, which was supposed by Carl Reichenbach and others to inhere in certain people and produce phenomena such as animal magnetism and mesmerism, and to be developed by various agencies, as by chemical or vital action, heat, light, magnets, etc.Synonyms: odyl, odylealsoattributivehistorical

1. (informal) Initialism of overdose.Synonyms: O.D.abbreviationalt-ofcountableinformalinitialismuncountable

2. (professional degree) Initialism of Doctor of Optometry; also O.D.abbreviationalt-ofcountableinitialismuncountable

3. (manufacturing) (of a pipe, tube, or shaft) Initialism of outer diameter or outside diameter.Antonyms: IDcountableuncountable

4. (especially military) Initialism of olive drab (“color of clothing, uniforms, tools, and equipment”).Examples: "“He went to’ds de back, ma’am.” The negro opened the door and slid his legs, clad in army O.D. and a pair of linoleum putties, to the ground. “‘I’ll go git ’im.”’"abbreviationalt-ofcountableespeciallyinitialismuncountable

5. (Australia, on road signs) Initialism of over dimension, used on route numbers for large vehicles, and normally followed by a numeral, e.g. OD5.Australiaabbreviationalt-ofcountableinitialismuncountable

6. (management) Initialism of organization development.abbreviationalt-ofcountableinitialismuncountable

1. (informal) To take an overdose of a drug, to overdose.Examples: "She told me she'd love me and I told her I'd do the same / Then I OD'd in Denver and I just can't remember her name"; "‘My brother,[…], is at Radley, on account of my parents thinking it a bad idea to have us both at the same school.’ ‘On account of your being twins?’ said Adrian. ‘Right, on account of my mother OD-ing on fertility drugs.[…]’"informal