| deinonychus | (noun) swift agile wolf-sized bipedal dinosaur having a large curved claw on each hind foot; of the Cretaceous | - |
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| johnnycake | (noun) cornbread usually cooked pancake-style on a griddle (chiefly New England) | Synonyms: johnny cake, journey cake |
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| nyctalopia | (noun) inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder | Synonyms: moon blindness, night blindness |
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| nyctophobia | (noun) a morbid fear of night or darkness | - |
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| nycturia | (noun) excessive urination at night; especially common in older men | Synonyms: nocturia |
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| onycholysis | (noun) separation of a nail from its normal attachment to the nail bed | - |
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| onychophoran | (noun) any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms | Synonyms: peripatus, velvet worm |
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| onychosis | (noun) any disease or disorder of the nails | - |
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| paronychia | (noun) infection in the tissues adjacent to a nail on a finger or toe | - |
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| pennycress | (noun) any of several plants of the genus Thlaspi | - |
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| ponycart | (noun) a cart with an underslung axle and two seats | Synonyms: donkey cart, pony cart, tub-cart |
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| tetranychid | (noun) web-spinning mite that attacks garden plants and fruit trees | Synonyms: spider mite |
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