Nouns in english starting with O

• onus — Noun – English ～ an onerous or difficult concern; "the burden of responsibility"; "that's a load off my mind"
• onward motion — Noun – English ～ the act of moving forward (as toward a goal)
• Onychium — Noun – English ～ small terrestrial ferns of Old World tropics and subtropics: clawed ferns; sometimes placed in family Cryptogrammataceae
• onychogalea — Noun – English ～ a genus of Macropodidae
• onycholysis — Noun – English ～ separation of a nail from its normal attachment to the nail bed
• Onychomys — Noun – English ～ grasshopper mice
• Onychophora — Noun – English ～ enigmatic small elongated wormlike terrestrial invertebrates of damp dark habitats in warm regions; distinct from the phylum Annelida; resemble slugs with legs and are sometimes described as the missing link between arthropods and annelids
• onychophoran — Noun – English ～ any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms
• onychosis — Noun – English ～ any disease or disorder of the nails
• onyx — Noun – English ～ a chalcedony with alternating black and white bands; used in making cameos
• 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
• 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
• 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

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