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| Obstructive Azoospermia |
| Azoospermia that is due to a blockage in the sperm duct system. |
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| Oligospermia |
| A low sperm count. |
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| Ovarian Failure |
| The failure of the ovary to respond to FSH stimulation from the pituitary because of damage to or malformation of the ovary, or a chronic disease such as autoimmune disease. Diagnosed by elevated FSH in the blood. |
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| Ovary |
| The female gonad (there are two ovaries in the female genital tract) that produces eggs and hormones. "Oophoritis" refers to inflammation of the ovary. |
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| Ovulation |
| The release of the egg (ovum) from the ovarian follicle. |
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| Ovulation Induction |
| Medical treatment performed to initiate ovulation. |
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