Nouns starting with A

• Asplenium rhizophyllum — Noun – English ～ ferns having lanceolate fronds that root at the tip
• Alnus rhombifolia — Noun – English ～ tree of western United States
• Archosargus rhomboidalis — Noun – English ～ sea bream of warm Atlantic waters
• alpha rhythm — Noun – English ～ the normal brainwave in the electroencephalogram of a person who is awake but relaxed; occurs with a frequency of 8-12 hertz
• atrioventricular nodal rhythm — Noun – English ～ the normal cardiac rhythm when the heart is controlled by the atrioventricular node
• Arundo richardii — Noun – English ～ tall grass of New Zealand grown for plumelike flower heads
• arme riddere — Noun – Danish ～ dessert bestående af franskbrødsskiver der er dypp ...
• alveolar ridge — Noun – English ～ a ridge that forms the borders of the upper and lower jaws and contains the sockets of the teeth
• Atlantic ridley — Noun – English ～ grey sea turtle of the Atlantic and Gulf Coasts of North America
• air rifle — Noun – English ～ a gun that propels a projectile by compressed air
• assault rifle — Noun – English ～ any of the automatic rifles or semiautomatic rifles with large magazines designed for military use
• automatic rifle — Noun – English ～ light machine gun
• accordance of rights — Noun – English ～ the act of granting rights; "the accordance to Canada of rights of access"
• alto rilievo — Noun – English ～ a sculptural relief in which forms extend out from the background to at least half their depth
• Arthur Rimbaud — Noun – English ～ French poet whose work influenced the surrealists (1854-1891)
• Ar Rimsal — Noun – English ～ a desert in southern Saudi Arabia
• anchor ring — Noun – English ～ a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke"
• annual ring — Noun – English ～ an annual formation of wood in plants as they grow
• Anemone riparia — Noun – English ～ thimbleweed of northern North America
• Anchusa riparia — Noun – English ～ anchusa of southern Africa having blue to red-purple flowers

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