Words starting with O that are validated

• onyx marble — Noun – English ～ a hard compact kind of calcite
• onyxis — Noun – English ～ toenail having its free tip or edges embedded in the surrounding flesh
• Onø — Last name – Danish
• Oo — Last name – Danish
• oocyte — Noun – English ～ a female gametocyte that develops into an ovum after two meiotic divisions
• oodles — Noun – English ～ a large number or amount; "made lots of new friends"; "she amassed stacks of newspapers"
• oogenesis — Noun – English ～ development of ova
• ooh — Verb – English ～ express admiration and pleasure by uttering `ooh' or `aah'; "They oohed and aahed when they unwrapped the presents"
• oology — Noun – English ～ the branch of zoology that studies eggs (especially birds' eggs and their size, shape, coloration, and number)
• oolong — Noun – English ～ Chinese tea leaves that have been partially fermented before being dried
• oomph — Noun – English ～ the activeness of an energetic personality
• oomph — Noun – English ～ attractiveness to the opposite sex
• oomycetes — Noun – English ～ nonphotosynthetic fungi that resemble algae and that reproduce by forming oospores; sometimes classified as protoctists
• Oona — First name – Danish
• oophorectomy — Noun – English ～ surgical removal of one of both ovaries
• oophoritis — Noun – English ～ inflammation of one or both ovaries
• oophorosalpingectomy — Noun – English ～ surgical removal of one or both ovaries and the corresponding Fallopian tubes
• Oort cloud — Noun – English ～ (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto; perturbations (as by other stars) can upset a comet's orbit and may send it tumbling toward the sun
• oort — Noun – English ～ Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992)
• Oortgiese — Last name – Danish

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