Glossary Of Terms Starting With
-O-

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Medical definitions of terms starting with 'O'

Occiput:
Hind-most region on the top of the head.

More medical terms starting with 'O'

Ophthalmalgia:
Eye pain.
Optical Prescription:
The units representing the amount of correction needed to normalize vision for distance are called 'diopters'.  A higher diopter means you are more nearsighted or farsighted.  A prescription is usually written as three numbers, for example:

     OD   -4.25 -1.75 X 180
     OS   -5.50 -1.25 X 175
        +2.25 Add OU

OD stands for the right eye, and OS for the left eye.  In this example, the first number (-4.25 and -5.50) is the degree of spherical nearsightedness or farsightedness.  The sign identifies whether you are nearsighted (minus sign) or farsighted (plus sign).  The second number (-1.75 and -1.25) is the degree of astigmatism, positive or negative.  The last number (180 and 175) is the axis, or the direction of your astigmatism.  An axis of 180° means the astigmatism is horizontal.  The "Add" at the end is for the reading part of a bifocal lens.  Sometimes only one number is written for each eye when there is no astigmatism.
Orotate:
An oratic acid salt (nucleic acid); an effective molecule for transporting minerals through cellular membranes.  Functions as an essential part of every living cell.
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More medical terms starting with 'O'

Osteochondritis:
Inflammation of a bone and its cartilage.
OTC:
See Over-The-Counter.
Otitis Externa:
Also called Swimmer's Ear, this is an infection of the outer ear canal caused by either fungus or bacteria.  Water that remains trapped in the ear canal (when swimming, for example) can provide a breeding ground for these bacteria and fungi.  Symptoms include redness of the outer ear; itching in the ear; pain, especially when touching or wiggling the earlobe; drainage from the ear; swollen glands in the neck; a swollen ear canal; hearing loss.
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More medical terms starting with 'O'

Ounce:
Approximately 28 grams.
Ounces:
See Ounce.
Over The Counter:
See Over-The-Counter.
Over-The-Counter:
A drug or medication that can legally be bought without a doctor's prescription being required.
Oxyurid:
Pin worm.
oz:
See Ounce.
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