| a hypothetical force formerly held to pervade all nature and to manifest itself in magnetism, mesmerism, chemical action, etc. |

noun, plural ODs or OD's, verb, OD'd or ODed or OD'ed, OD'ing or OD⋅ing.| 1. | an overdose of a drug, esp. a fatal one. |
| 2. | a person who has taken an overdose of a drug, esp. one who has become seriously ill or has died from such an overdose. |
| 3. | to take an overdose of a drug. |
| 4. | to die from an an overdose of a drug. |
| 5. | to have or experience an excessive amount or degree of something. |

OD
|
OD or O.D.
abbr.
Doctor of Optometry
Latin oculus dexter (right eye)