Words in english starting with A

• 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
• angle of reflection — Noun – English ～ the angle between a reflected ray and a line perpendicular to the reflecting surface at the point of incidence
• acquired reflex — Noun – English ～ an acquired response that is under the control of (conditional on the occurrence of) a stimulus
• accommodation reflex — Noun – English ～ reflex changes in the eyes that enable an object to be focused on the retina
• act reflexively — Verb – English ～ act in an uncontrolled manner
• angle of refraction — Noun – English ～ the angle between a refracted ray and a line perpendicular to the surface between the two media at the point of refraction
• aqua regia — Noun – English ～ a yellow fuming corrosive mixture of nitric and hydrochloric acid that dissolves metals (including gold)
• ancien regime — Noun – English ～ a political and social system that no longer governs (especially the system that existed in France before the French Revolution)
• authoritarian regime — Noun – English ～ a government that concentrates political power in an authority not responsible to the people

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