Ord der begynder med A som er valideret

• annual ring — Navneord – Engelsk ～ an annual formation of wood in plants as they grow
• Anemone riparia — Navneord – Engelsk ～ thimbleweed of northern North America
• Anchusa riparia — Navneord – Engelsk ～ anchusa of southern Africa having blue to red-purple flowers
• Andersen-Risager — Efternavn – Dansk
• Araguaya River — Navneord – Engelsk ～ a river in central Brazil that flows generally northward (with many falls) to join the Tocantins River
• Araguaia River — Navneord – Engelsk ～ a river in central Brazil that flows generally northward (with many falls) to join the Tocantins River
• Allegheny River — Navneord – Engelsk ～ a river that rises in Pennsylvania and flows north into New York and then back south through Pennsylvania again to join the Monongahela River at Pittsburgh which is the beginning of the Ohio River
• Aire River — Navneord – Engelsk ～ a river in northern England that flows southeast through West Yorkshire
• Alabama River — Navneord – Engelsk ～ a river in Alabama formed by the confluence of the Coosa and Tallapoosa Rivers near Montgomery; flows southwestward to become a tributary of the Mobile River
• Apalachicola River — Navneord – Engelsk ～ a river in northwestern Florida formed by the confluence of the Chattahoochee River and the Flint River at the Florida border
• Amur River — Navneord – Engelsk ～ an Asian river between China and Russia; flows into the Sea of Okhotsk
• Amazon River — Navneord – Engelsk ～ a major South American river; arises in the Andes and flows eastward into the South Atlantic; the world's 2nd longest river (4000 miles)
• Angara River — Navneord – Engelsk ～ a river in southeastern Siberia that flows northwest from Lake Baikal to become a tributary of the Yenisei River
• Arno River — Navneord – Engelsk ～ a river in central Italy rising in the Apennines and flowing through Florence and Pisa to the Ligurian Sea
• Arkansas River — Navneord – Engelsk ～ a river that rises in the Rocky Mountains in Colorado and flows southeast through Kansas and Oklahoma and through Arkansas to become a tributary of the Mississippi River
• Argun River — Navneord – Engelsk ～ a river in eastern Asia that arises in China and flows northeast along the border between China and Russia to become a tributary of the Amur River
• Aare River — Navneord – Engelsk ～ a river in north central Switzerland that runs northeast into the Rhine
• Amorphophallus rivieri — Navneord – Engelsk ～ foul-smelling somewhat fleshy tropical plant of southeastern Asia cultivated for its edible corms or in the greenhouse for its large leaves and showy dark red spathe surrounding a large spadix
• Abou-Rjeily — Efternavn – Dansk
• acceptor RNA — Navneord – Engelsk ～ RNA molecules present in the cell (in at least 20 varieties, each variety capable of combining with a specific amino acid) that attach the correct amino acid to the protein chain that is being synthesized at the ribosome of the cell (according to directions coded in the mRNA)

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