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～ a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
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～ any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
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～ the 1st letter of the Roman alphabet
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～ (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
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～ the basic unit of electric current adopted under the Systeme International d'Unites; "a typical household circuit carries 15 to 50 amps"
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～ one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
A
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～ the blood group whose red cells carry the A antigen
A'man
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～ the Israeli military intelligence which produces comprehensive national intelligence briefings for the prime minister and the cabinet
A.E.
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～ Irish writer whose pen name was A.E. (1867-1935)
AA
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～ an international organization that provides a support group for persons trying to overcome alcoholism
aa
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～ a dry form of lava resembling clinkers
AA
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～ an associate degree in arts
AAA
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～ an aneurysm of the abdominal aorta associated with old age and hypertension
Aachen
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～ a city in western Germany near the Dutch and Belgian borders; formerly it was Charlemagne's northern capital
Aalborg
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～ a city and port in northern Jutland
aalii
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～ a small Hawaiian tree with hard dark wood
Aalst
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～ a town in central Belgium
Aalto
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～ Finnish architect and designer of furniture (1898-1976)
Aar
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～ a river in north central Switzerland that runs northeast into the Rhine
aardvark
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～ nocturnal burrowing mammal of the grasslands of Africa that feeds on termites; sole extant representative of the order Tubulidentata