Aster novi-belgii
— Navneord
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～ North American perennial herb having small autumn-blooming purple or pink or white flowers; widely naturalized in Europe
Alfred Noyes
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～ English poet (1880-1958)
amygdaloid nucleus
— Navneord
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～ an almond-shaped neural structure in the anterior part of the temporal lobe of the cerebrum; intimately connected with the hypothalamus and the hippocampus and the cingulate gyrus; as part of the limbic system it plays an important role in motivation and emotional behavior
Aralia nudicaulis
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～ common perennial herb having aromatic roots used as a substitute for sarsaparilla; central and eastern North America
attractive nuisance
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～ anything on your premises that might attract children into danger or harm; "their swimming pool is an attractive nuisance; they should fence it in"
abatable nuisance
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～ a nuisance that can remedied (suppressed or extinguished or rendered harmless); "the continued existence of an abatable nuisance is not authorized under the law"
aleph-null
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～ the smallest infinite integer
algebraic number
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～ root of an algebraic equation with rational coefficients
Avogadro's number
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～ the number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000)
Avogadro number
— Navneord
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～ the number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000)
atomic number 87
— Navneord
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～ a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
atomic number 94
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～ a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239
atomic number 30
— Navneord
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～ a bluish-white lustrous metallic element; brittle at ordinary temperatures but malleable when heated; used in a wide variety of alloys and in galvanizing iron; it occurs naturally as zinc sulphide in zinc blende
atomic number 35
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～ a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water
atomic number 61
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～ a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium
atomic number 96
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～ a radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei
atomic number 56
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～ a soft silvery metallic element of the alkali earth group; found in barite
atomic number 27
— Navneord
– Engelsk
～ a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
atomic number 53
— Navneord
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～ a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)
atomic number 14
— Navneord
– Engelsk
～ a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors