Words starting with A that are validated

• alto clef — Noun – English ～ a clef that puts middle C on the third line of a staff
• Aristolochia clematitis — Noun – English ～ creeping plant having curving flowers thought to resemble fetuses; native to Europe; naturalized Great Britain and eastern North America
• Andrew's clintonia — Noun – English ～ plant with nearly leafless stalk topped by a cluster of red or reddish lavender flowers; California to Oregon
• alligator clip — Noun – English ～ a clip with a spring that closes the metal jaws
• alarm clock — Noun – English ～ a clock that wakes a sleeper at some preset time
• ammonia clock — Noun – English ～ an atomic clock based on vibrational frequency of the nitrogen atom in the ammonia molecule
• analog clock — Noun – English ～ a clock that displays the time of day by the position of hands on a dial
• atomic clock — Noun – English ～ a timepiece that derives its time scale from the vibration of atoms or molecules
• altostratus cloud — Noun – English ～ a stratus cloud at an intermediate altitude of 2 or 3 miles
• altocumulus cloud — Noun – English ～ a cumulus cloud at an intermediate altitude of 2 or 3 miles
• alpine clover — Noun – English ～ European mountain clover with fragrant usually pink flowers
• alpine clubmoss — Noun – English ～ a variety of club moss
• Anas clypeata — Noun – English ～ freshwater duck of the northern hemisphere having a broad flat bill
• anthracite coal — Noun – English ～ a hard natural coal that burns slowly and gives intense heat
• Adelie Coast — Noun – English ～ a costal region of Antarctica to the south of Australia; noted for its large colonies of penguins
• Atlantic Coast — Noun – English ～ a coast of the Atlantic Ocean
• American cockroach — Noun – English ～ large reddish brown free-flying cockroach originally from southern United States but now widely distributed
• Australian cockroach — Noun – English ～ widely distributed in warm countries
• Asiatic cockroach — Noun – English ～ dark brown cockroach originally from orient now nearly cosmopolitan in distribution
• atomic cocktail — Noun – English ～ an oral dose of radioactive substance used in treatment and diagnosis of cancer

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