Nouns starting with A

• amitriptyline hydrochloride — Noun – English ～ a tricyclic antidepressant drug (trade name Elavil) with serious side effects; interacts with many other medications
• acid hydrogen — Noun – English ～ a hydrogen atom in an acid that forms a positive ion when the acid dissociates
• acidic hydrogen — Noun – English ～ a hydrogen atom in an acid that forms a positive ion when the acid dissociates
• ammonium hydroxide — Noun – English ～ a water solution of ammonia
• aluminum hydroxide — Noun – English ～ white crystalline compound that occurs naturally as the mineral gibbsite
• aluminium hydroxide — Noun – English ～ white crystalline compound that occurs naturally as the mineral gibbsite
• Aplectrum hyemale — Noun – English ～ North American orchid bearing a single leaf and yellowish-brown flowers
• Astreus hygrometricus — Noun – English ～ a common species of earthstar widely distributed in sandy soil; the gleba is a pale tan
• Atriplex hymenelytra — Noun – English ～ handsome low saltbush of arid southwestern United States and Mexico having blue-green prickly-edged leaves often used for Christmas decoration
• attention deficit hyperactivity disorder — Noun – English ～ a condition (mostly in boys) characterized by behavioral and learning disorders
• auditory hyperesthesia — Noun – English ～ abnormal acuteness of hearing due to increased irritability of the sensory neural mechanism; characterized by intolerance for ordinary sound levels
• Amaranthus hybridus hypochondriacus — Noun – English ～ tall showy tropical American annual having hairy stems and long spikes of usually red flowers above leaves deeply flushed with purple; seeds often used as cereal
• Amaranthus hypochondriacus — Noun – English ～ leaves sometimes used as potherbs; seeds used as cereal; southern United States to Central America; India and China
• Arachis hypogaea — Noun – English ～ widely cultivated American plant cultivated in tropical and warm regions; showy yellow flowers on stalks that bend over to the soil so that seed pods ripen underground
• Actitis hypoleucos — Noun – English ～ a variety of sandpiper
• Avogadro's hypothesis — Noun – English ～ the principle that equal volumes of all gases (given the same temperature and pressure) contain equal numbers of molecules
• anemic hypoxia — Noun – English ～ hypoxia resulting from a decreased concentration of hemoglobin
• anise hyssop — Noun – English ～ much-branched North American herb with an odor like fennel
• anxiety hysteria — Noun – English ～ a form of hysteria having features of both conversion disorder and anxiety neurosis
• Alexander I — Noun – English ～ the czar of Russia whose plans to liberalize the government of Russia were unrealized because of the wars with Napoleon (1777-1825)

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