Nouns starting with A

• A-horizon — Noun – English ～ the top layer of a soil profile; usually contains humus
• antidiuretic hormone — Noun – English ～ hormone secreted by the posterior pituitary gland (trade name Pitressin) and also by nerve endings in the hypothalamus; affects blood pressure by stimulating capillary muscles and reduces urine flow by affecting reabsorption of water by kidney tubules
• androgenic hormone — Noun – English ～ male sex hormone that is produced in the testes and responsible for typical male sexual characteristics
• adrenocorticotropic hormone — Noun – English ～ a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex
• adrenocorticotrophic hormone — Noun – English ～ a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex
• air horn — Noun – English ～ a pneumatic horn
• air horn — Noun – English ～ air intake of a carburetor
• anterior horn — Noun – English ～ one of the two roots of a spinal nerve that passes ventrally from the spinal cord and that consists of motor fibers
• automobile horn — Noun – English ～ a device on an automobile for making a warning noise
• American hornbeam — Noun – English ～ tree or large shrub with grey bark and blue-green leaves that turn red-orange in autumn
• Asian horseshoe crab — Noun – English ～ horseshoe crab of the coast of eastern Asia
• Atriplex hortensis — Noun – English ～ Asiatic plant resembling spinach often used as a potherb; naturalized in Europe and North America
• air hose — Noun – English ～ a hose that carries air under pressure
• air hostess — Noun – English ～ a woman steward on an airplane
• Afghan hound — Noun – English ～ tall graceful breed of hound with a long silky coat; native to the Near East
• ampere-hour — Noun – English ～ a unit of charge equal to 3600 coulombs
• apartment house — Noun – English ～ a building that is divided into apartments
• auction house — Noun – English ～ a firm that conducts auctions
• adobe house — Noun – English ～ a house built of sod or adobe laid in horizontal courses
• Alfred Edward Housman — Noun – English ～ English poet (1859-1936)

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