atomic mass unit(n = noun.quantity) - unit of mass for expressing masses of atoms or molecules;
is a kind of mass unit

absorption unit, acceleration unit, administrative unit, afghan monetary unit, air mass, air unit, albanian monetary unit, algerian monetary unit, allocation unit, angolan monetary unit, angstrom unit, angular unit, apothecaries' unit, area unit, argentine monetary unit, armenian monetary unit, army unit, artillery unit, astronomical unit, astronomy unit, atomic, atomic bomb, atomic clock, atomic cocktail, atomic energy, atomic energy commission, atomic explosion, atomic mass, atomic number, atomic number 1, atomic number 10, atomic number 100, atomic number 101, atomic number 102, atomic number 103, atomic number 104, atomic number 105, atomic number 106, atomic number 107, atomic number 108, atomic number 109, atomic number 11, atomic number 110, atomic number 111, atomic number 112, atomic number 113, atomic number 114, atomic number 115, atomic number 116, atomic number 12, atomic number 13, atomic number 14, atomic number 15, atomic number 16, atomic number 17, atomic number 18, atomic number 19, atomic number 2, atomic number 20, atomic number 21, atomic number 22, atomic number 23, atomic number 24, atomic number 25, atomic number 26, atomic number 27, atomic number 28, atomic number 29, atomic number 3, atomic number 30, atomic number 31, atomic number 32, atomic number 33, atomic number 34, atomic number 35, atomic number 36, atomic number 37, atomic number 38, atomic number 39, atomic number 4, atomic number 40, atomic number 41, atomic number 42, atomic number 43, atomic number 44, atomic number 45, atomic number 46, atomic number 47, atomic number 48, atomic number 49, atomic number 5, atomic number 50, atomic number 51, atomic number 52, atomic number 53, atomic number 54, atomic number 55, atomic number 56, atomic number 57, atomic number 58, atomic number 59, atomic number 6, atomic number 60, atomic number 61, atomic number 62, atomic number 63, atomic number 64, atomic number 65, atomic number 66, atomic number 67, atomic number 68, atomic number 69, atomic number 7, atomic number 70, atomic number 71, atomic number 72, atomic number 73, atomic number 74, atomic number 75, atomic number 76, atomic number 77, atomic number 78, atomic number 79, atomic number 8, atomic number 80, atomic number 81, atomic number 82, atomic number 83, atomic number 84, atomic number 85, atomic number 86, atomic number 87, atomic number 88, atomic number 89, atomic number 9, atomic number 90, atomic number 91, atomic number 92, atomic number 93, atomic number 94, atomic number 95, atomic number 96, atomic number 97, atomic number 98, atomic number 99, atomic physics, atomic pile, atomic power, atomic reactor, atomic spectrum, atomic theory, atomic warhead, atomic weight, austrian monetary unit, avoirdupois unit, azerbaijani monetary unit, bahrainian monetary unit, bangladeshi monetary unit, belarusian monetary unit, bhutanese monetary unit, black mass, board of trade unit, bolivian monetary unit, booster unit, botswana monetary unit, brazilian monetary unit, british capacity unit, british monetary unit, british thermal unit, bulgarian monetary unit, cambodian monetary unit, candlepower unit, capacitance unit, capacity unit, cape verde monetary unit, center of mass, central processing unit, centre of mass, charge per unit, charge unit, chilean monetary unit, chinese monetary unit, colombian monetary unit, computer memory unit, conductance unit, conservation of mass, coronary care unit, costa rican monetary unit, critical mass, cubage unit, cuban monetary unit, cubature unit, cubic content unit, current unit, cypriot monetary unit, czech monetary unit, danish monetary unit, displacement unit, dominican monetary unit, dry unit, dutch monetary unit, ecuadoran monetary unit, egyptian monetary unit, el salvadoran monetary unit, elastance unit, electromagnetic unit, electrostatic unit, energy unit, engineer corps. (a) in the unit, equatorial guinea monetary unit, estonian monetary unit, ethiopian monetary unit, explosive unit, family unit, field strength unit, finnish monetary unit, flux density unit, flux unit, force per unit area, force unit, fractional monetary unit, gambian monetary unit, georgian monetary unit, german monetary unit, ghanian monetary unit, gravitational mass, greek monetary unit, guatemalan monetary unit, guinea-bissau monetary unit, guinean monetary unit, haitian monetary unit, heat unit, high mass, honduran monetary unit, hungarian monetary unit, ice mass, icelandic monetary unit, illumination unit, imperial capacity unit, indian monetary unit, indonesian monetary unit, inductance unit, inertial mass, intensive care unit, international atomic energy agency, iranian monetary unit, iraqi monetary unit, irish monetary unit, israeli monetary unit, italian monetary unit, japanese monetary unit, jordanian monetary unit, kazakhstani monetary unit, kenyan monetary unit, kuwaiti monetary unit, kyrgyzstani monetary unit, language unit, laotian monetary unit, latvian monetary unit, law of conservation of mass, law of mass action, lebanese monetary unit, lesotho monetary unit, libyan monetary unit, light unit, linear unit, linguistic unit, liquid unit, lithuanian monetary unit, low mass, luminance unit, luminous flux unit, luminous intensity unit, macao monetary unit, magnetic flux unit, magnetomotive force unit, malawian monetary unit, malaysian monetary unit, maltese monetary unit, mass, mass action, mass card, mass culture, mass defect, mass deficiency, mass energy, mass hysteria, mass medium, mass meeting, mass murder, mass murderer, mass noun, mass number, mass production, mass rapid transit, mass spectrograph, mass spectrometer, mass spectrometry, mass spectroscopic, mass spectroscopy, mass spectrum, mass unit, mauritanian monetary unit, mauritian monetary unit, measuring unit, metric capacity unit, metric linear unit, metric unit, metric weight unit, metrical unit, mexican monetary unit, military unit, moldovan monetary unit, monetary unit, mongolian monetary unit, moroccan monetary unit, mozambique monetary unit, myanmar monetary unit, nautical linear unit, naval unit, neonatal intensive care unit, nepalese monetary unit, nicaraguan monetary unit, nigerian monetary unit, north korean monetary unit, norwegian monetary unit, omani monetary unit, pain unit, pakistani monetary unit, panamanian monetary unit, papuan monetary unit, paraguayan monetary unit, paramilitary unit, peruvian monetary unit, philippine monetary unit, polish monetary unit, political unit, portuguese monetary unit, potential unit, power unit, pressure unit, printing unit, qatari monetary unit, quantity unit, radioactivity unit, relative atomic mass, relative molecular mass, relativistic mass, relativistic mass equation, resistance unit, rest mass, romanian monetary unit, russian monetary unit, rydberg unit, sao thome e principe monetary unit, saudi arabian monetary unit, semiconductor unit, seychelles monetary unit, sierra leone monetary unit, slovakian monetary unit, social unit, somalian monetary unit, sound unit, south african monetary unit, south korean monetary unit, spanish monetary unit, sparrow unit, speaker unit, sri lankan monetary unit, sudanese monetary unit, surinamese monetary unit, swaziland monetary unit, swedish monetary unit, syrian monetary unit, tajikistani monetary unit, tanzanian monetary unit, telephone unit, temperature unit, thai monetary unit, time unit, tongan monetary unit, troy unit, tunisian monetary unit, turkish monetary unit, turkmen monetary unit, ugandan monetary unit, ukranian monetary unit, unit, unit cell, unit character, unit cost, unit investment trust, unit matrix, unit of ammunition, unit of measurement, unit of time, unit of viscosity, unit trust, united arab emirate monetary unit, united states dry unit, united states liquid unit, uruguayan monetary unit, uzbekistani monetary unit, venezuelan monetary unit, vietnamese monetary unit, visual display unit, volume unit, wall unit, weapon of mass destruction, weight unit, western samoan monetary unit, work unit, yemeni monetary unit, yugoslavian monetary unit, zairese monetary unit, zambian monetary unit