Ord der begynder med A som er valideret

• Amaranthus hybridus erythrostachys — Navneord – Engelsk ～ 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
• aromatic hydrocarbon — Navneord – Engelsk ～ a hydrocarbon that contains one or more benzene rings that are characteristic of the benzene series of organic compounds
• amitriptyline hydrochloride — Navneord – Engelsk ～ a tricyclic antidepressant drug (trade name Elavil) with serious side effects; interacts with many other medications
• acid hydrogen — Navneord – Engelsk ～ a hydrogen atom in an acid that forms a positive ion when the acid dissociates
• acidic hydrogen — Navneord – Engelsk ～ a hydrogen atom in an acid that forms a positive ion when the acid dissociates
• ammonium hydroxide — Navneord – Engelsk ～ a water solution of ammonia
• aluminum hydroxide — Navneord – Engelsk ～ white crystalline compound that occurs naturally as the mineral gibbsite
• aluminium hydroxide — Navneord – Engelsk ～ white crystalline compound that occurs naturally as the mineral gibbsite
• Aplectrum hyemale — Navneord – Engelsk ～ North American orchid bearing a single leaf and yellowish-brown flowers
• Astreus hygrometricus — Navneord – Engelsk ～ a common species of earthstar widely distributed in sandy soil; the gleba is a pale tan
• Atriplex hymenelytra — Navneord – Engelsk ～ 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 — Navneord – Engelsk ～ a condition (mostly in boys) characterized by behavioral and learning disorders
• auditory hyperesthesia — Navneord – Engelsk ～ abnormal acuteness of hearing due to increased irritability of the sensory neural mechanism; characterized by intolerance for ordinary sound levels
• Amaranthus hybridus hypochondriacus — Navneord – Engelsk ～ 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 — Navneord – Engelsk ～ leaves sometimes used as potherbs; seeds used as cereal; southern United States to Central America; India and China
• Arachis hypogaea — Navneord – Engelsk ～ 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 — Navneord – Engelsk ～ a variety of sandpiper
• Avogadro's hypothesis — Navneord – Engelsk ～ the principle that equal volumes of all gases (given the same temperature and pressure) contain equal numbers of molecules
• anemic hypoxia — Navneord – Engelsk ～ hypoxia resulting from a decreased concentration of hemoglobin
• anise hyssop — Navneord – Engelsk ～ much-branched North American herb with an odor like fennel

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