Nouns starting with A

• Aralia nudicaulis — Noun – English ～ common perennial herb having aromatic roots used as a substitute for sarsaparilla; central and eastern North America
• attractive nuisance — Noun – English ～ 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 — Noun – English ～ 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 — Noun – English ～ the smallest infinite integer
• algebraic number — Noun – English ～ root of an algebraic equation with rational coefficients
• Avogadro's number — Noun – English ～ the number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000)
• Avogadro number — Noun – English ～ the number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000)
• atomic number 87 — Noun – English ～ a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
• atomic number 94 — Noun – English ～ 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 — Noun – English ～ 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 — Noun – English ～ a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water
• atomic number 61 — Noun – English ～ 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 — Noun – English ～ a radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei
• atomic number 56 — Noun – English ～ a soft silvery metallic element of the alkali earth group; found in barite
• atomic number 27 — Noun – English ～ a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
• atomic number 53 — Noun – English ～ 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 — Noun – English ～ 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
• atomic number 5 — Noun – English ～ a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder
• atomic number 65 — Noun – English ～ a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite
• atomic number 45 — Noun – English ～ a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum

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