Category: O
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Opalescent
Iridescent; similar to an opal with respect to the colors produced.
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Oospore
A spore formed by the union of opposite sexual elements.
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Oosporangium
The female portion in the sexual formation of oospores.
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Oophorrhagia
Hemorrhage from an ovulatory site severe enough to cause clinical symptoms or signs.
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Oophorohysterectomy
Surgical removal of the uterus, fallopian tubes, and ovaries (total abdominal hysterectomy with salpingo-oophorectomy). Surgical excision of both the uterus and ovaries, also referred to as ovariohysterectomy.
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Oolemma
The plasma membrane of the oocyte.
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Ookinesis
The mitosis of oogonia in the embryonic ovary to form primary oocytes.
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Ooblast
The diploid cell from which an oogonium develops.
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Onychotomy
Surgical incision of a fingernail or toenail.
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Onychotillomania
A neurotic tendency to pick at the nails.