Nouns starting with A

• addition reaction — Noun – English ～ a chemical reaction in which one molecule is added to another
• atomic reactor — Noun – English ～ a nuclear reactor that uses controlled nuclear fission to generate energy
• Age of Reason — Noun – English ～ a movement in Europe from about 1650 until 1800 that advocated the use of reason and individualism instead of tradition and established doctrine; "the Enlightenment brought about many humanitarian reforms"
• accounts receivable — Noun – English ～ a creditor's accounts of money owed to him; normally arise from the sale of products or services
• alpha-adrenergic receptor — Noun – English ～ receptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasoconstriction and relaxation of intestinal muscles and contraction of smooth muscles)
• alpha receptor — Noun – English ～ receptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasoconstriction and relaxation of intestinal muscles and contraction of smooth muscles)
• autosomal recessive defect — Noun – English ～ a disease caused by the presence of two recessive mutant genes on an autosome
• autosomal recessive disease — Noun – English ～ a disease caused by the presence of two recessive mutant genes on an autosome
• automatic face recognition — Noun – English ～ biometric identification by scanning a person's face and matching it against a library of known faces; "they used face recognition to spot known terrorists"
• air reconnaissance — Noun – English ～ reconnaissance either by visual observation from the air or through the use of airborne sensors
• audio recording — Noun – English ～ a recording of acoustic signals
• arteria rectalis — Noun – English ～ one of the arteries supplying the rectal area
• alizarin red — Noun – English ～ any of various acid dyes; used for dyeing wool scarlet red
• alizarine red — Noun – English ～ a bright orange-red color produced in cotton cloth with alizarine dye
• American red elder — Noun – English ～ common North American shrub or small tree
• American red plum — Noun – English ～ wild plum trees of eastern and central North America having red-orange fruit with yellow flesh
• American redstart — Noun – English ～ flycatching warbler of eastern North America the male having bright orange on sides and wings and tail
• Andaman redwood — Noun – English ～ mottled curly-grained wood of Pterocarpus indicus
• Australian reed grass — Noun – English ～ tall Australian reedlike grass sometimes used for hay
• anatomical reference — Noun – English ～ an expression that relates to anatomy

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