Nouns

• Arceuthobium — Noun – English ～ genus of chiefly American plants parasitic on conifers
• aortic arch — Noun – English ～ the part of the aorta that arches and turns downward
• alveolar arch — Noun – English ～ the part of the upper or lower jawbones in which the teeth are set
• arch — Noun – English ～ (architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it
• arch — Noun – English ～ a curved bony structure supporting or enclosing organs (especially the inner sides of the feet)
• arch — Noun – English ～ a passageway under a curved masonry construction; "they built a triumphal arch to memorialize their victory"
• arch — Noun – English ～ a curved shape in the vertical plane that spans an opening
• abutment arch — Noun – English ～ an arch supported by an abutment
• archaebacteria — Noun – English ～ considered ancient life forms that evolved separately from bacteria and blue-green algae
• archaebacterium — Noun – English ～ considered ancient life forms that evolved separately from bacteria and blue-green algae
• archaeobacteria — Noun – English ～ considered ancient life forms that evolved separately from bacteria and blue-green algae
• archaeologist — Noun – English ～ an anthropologist who studies prehistoric people and their culture
• archaeology — Noun – English ～ the branch of anthropology that studies prehistoric people and their cultures
• archaeopteryx — Noun – English ～ extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds
• archaeornis — Noun – English ～ extinct primitive toothed bird with a long feathered tail and three free clawed digits on each wing
• Archaeornithes — Noun – English ～ primitive reptile-like fossil birds of the Jurassic or early Cretaceous
• Archaeozoic aeon — Noun – English ～ the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
• Archaeozoic — Noun – English ～ the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
• archaicism — Noun – English ～ the use of an archaic expression
• archaism — Noun – English ～ the use of an archaic expression

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