Words in english starting with A

• aspect ratio — Noun – English ～ the ratio of the width to the height of a tv picture
• Ambrogio Damiano Achille Ratti — Noun – English ～ pope who signed a treaty with Mussolini recognizing the Vatican City as an independent state (1857-1939)
• Achille Ratti — Noun – English ～ pope who signed a treaty with Mussolini recognizing the Vatican City as an independent state (1857-1939)
• American rattlebox — Noun – English ～ tropical American annual herb having an inflated pod in which the ripe seeds rattle
• alpha ray — Noun – English ～ the radiation of alpha particles during radioactive decay
• actinic ray — Noun – English ～ electromagnetic radiation that can produce photochemical reactions
• acetate rayon — Noun – English ～ a fabric made from fibers of cellulose acetate
• acoustic reactance — Noun – English ～ opposition to the flow of sound through a surface; acoustic resistance is the real component of acoustic impedance and acoustic reactance is the imaginary component
• allergic reaction — Noun – English ～ hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity
• aldol reaction — Noun – English ～ a reaction of aldehydes resulting in an aldol
• anxiety reaction — Noun – English ～ an anxiety disorder characterized by chronic free-floating anxiety and such symptoms as tension or sweating or trembling or lightheadedness or irritability etc that has lasted for more than six months
• anamnestic reaction — Noun – English ～ renewed rapid production of an antibody on the second (or subsequent) encounter with the same antigen
• 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

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