9-letter words that end in a
- myxamoeba — an amoeba-like cell produced by a spore
- myxoedema — a condition characterized by thickening of the skin, blunting of the senses and intellect, and labored speech, associated with hypothyroidism.
- n'djamena — Chadic.
- nagarjuna — c. 150–c. 250 ad, Indian Buddhist monk, founder of the Madhyamika (Middle Path) school of Mahayana Buddhism: noted for his philosophical writings
- nanotesla — one billionth of a tesla.
- natatoria — Plural form of natatorium.
- naumachia — a mock sea fight, given as a spectacle among the ancient Romans.
- naupathia — (medicine) seasickness.
- neisseria — any of several spherical bacteria of the genus Neisseria, certain species of which, as N. gonorrhoeae, are pathogenic for humans.
- nemophila — any of a genus, Nemophila, of low-growing hairy annual plants, esp N. menziesii, grown for its blue or white flowers: family Hydrophyllaceae
- neophilia — Love of new things.
- neophobia — Extreme or irrational fear or dislike of anything new, novel, or unfamiliar.
- neopilina — any primitive mollusk of the genus Neopilina, having a serial repetition of internal organs that suggests a close relationship to the annelids.
- neoplasia — Pathology. tumor growth.
- nephridia — the excretory organ of many invertebrates, consisting of a tubule with one end opening into the body cavity and the other opening into a pore at the body surface.
- neuralgia — sharp and paroxysmal pain along the course of a nerve.
- neurinoma — A schwannoma.
- neuroglia — a class of cells in the brain and spinal cord that form a supporting structure for the neurons and provide them with insulation.
- new media — developing forms of media, usually electronic, regarded as being experimental.
- nicaragua — a republic in Central America. 57,143 sq. mi. (148,000 sq. km). Capital: Managua.
- nicomedia — an ancient city in NW Asia Minor, at the head of the Gulf of Astacus, in present-day Turkey: modern Izmit is on its site.
- nicotiana — any plant belonging to the genus Nicotiana, of the nightshade family, especially one grown for its ornamental value, as flowering tobacco.
- nidamenta — egg capsules
- nino rota — Nino [nee-naw] /ˈni nɔ/ (Show IPA), 1911–1979, Italian composer.
- noctiluca — a dinoflagellate of the genus Noctiluca, capable of producing light and, in groups, of causing a luminous appearance of the sea.
- non grata — not welcome: Reporters were non grata at the diplomatic reception.
- north sea — an arm of the Atlantic between Great Britain and the European mainland. About 201,000 sq. mi. (520,600 sq. km); greatest depth, 1998 feet (610 meters).
- nostalgia — a wistful desire to return in thought or in fact to a former time in one's life, to one's home or homeland, or to one's family and friends; a sentimental yearning for the happiness of a former place or time: a nostalgia for his college days.
- notabilia — things worthy of notice
- notopodia — Plural form of notopodium.
- novillada — (bullfighting) A bullfight between a novillo and a novillero.
- nukualofa — a Polynesian kingdom consisting of three groups of islands in the S Pacific, NE of New Zealand: a former British protectorate. About 270 sq. mi. (700 sq. km). Capital: Nukualofa.
- nullipara — a woman who has never borne a child.
- nyctalgia — night pain that occurs in the sleep.
- oblongata — medulla oblongata.
- octahedra — Plural form of octahedron.
- oenothera — any plant of the large taxonomically complicated American genus Oenothera, typically having yellow flowers that open in the evening: family Onagraceae
- old media — the media in existence before the arrival of the internet, such as newspapers, books, television, and cinema
- oligaemia — a reduction in the volume of the blood, as occurs after haemorrhage
- ommatidia — one of the radial elements composing a compound eye.
- omophagia — the eating of raw food, especially raw meat.
- on camera — a device for capturing a photographic image or recording a video, using film or digital memory.
- oniomania — an uncontrollable desire to buy things.
- opa-locka — a town in S Florida.
- opsomania — an extreme enthusiasm for a particular food
- orchestra — a group of performers on various musical instruments, including especially stringed instruments of the viol class, clarinets and flutes, cornets and trombones, drums, and cymbals, for playing music, as symphonies, operas, popular music, or other compositions.
- orthopnea — difficult or painful breathing except in an erect sitting or standing position.
- oskaloosa — a city in SE central Iowa.
- osmeteria — glands in some caterpillars that secrete foul-smelling substances to deter predators
- ossifraga — a large fulmar