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Opioid

Medical term · O

Any narcotic, natural or synthetic, that behaves in the body like an opium-derived drug.

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Related terms

Opiate

Any painkilling drug such as morphine or codeine derived from the opium poppy.
Optic disk

The front surface of the optic nerve, where all the retinal nerve fibers come together to carry an image to the brain.
Ophthalmoscope

An instrument with a light and mirrors for examining the deep interior of the eye.

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