A unit of mass equal to 1/12 the mass of a carbon-12 nucleus, which is 1.660 538 73 × 10-27 kg ± 0.000 000 13 × 10-27 kg [1998 CODATA values]. Abbreviated as amu or u. Sometimes called the dalton, aft [..]

A relative mass unit based on the atomic weight of carbon 12, which is taken to be 12; the atomic mass of hydrogen is 1.008 amu. The atomic mass unit (amu) is 1.660 -27 kg.

It is equal to one-twelfth the mass of C -12 isotope of carbon, 1 amu = 1.66x 10-27 Kg.

One-twelfth of the mass of a carbon-12 atom. It is approximately equal to the mass of a single proton or neutron.

[noun] One atomic mass unit (amu or u) is defined as 1/12 the mass of the standard carbon-12 isotope, or 1.66 × 10-27 kg.

One-twelfth of the mass of carbon-12, or 1.6605655 x 10-27 kg.

Relative mass unit (u) of an isotope based on the standard of the carbon-12 isotope, which is defined as a mass of exactly 12.00 u; one atomic mass unit (I u) is 1/12 the mass of a carbon-12 atom

1 amu is equal to one twelfth of the mass of a carbon-12 atom.

(chemistry) a unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon

Special unit of mass used to express the mass of atoms and molecules (Lesson 8)

(n.) Convenient unit for measuring the mass of an atom or molecule: 1 atomic mass unit is defined as I /12 the atomic mass of the most abundant carbon isotope, 12C. A=12 for 12C.

Atomic Mass Unit (u): This is a convenient mass unit to use when dealing with the masses of atoms and nuclear particles. Were the mass expressed in kilograms the values would be so tiny they would be [..]

a unit of mass equal to 1/12 the mass of the carbon isotope with mass number 12, approximately 1.6604 x 10E-24 gram.

a unit of mass equal to 1/12 of the mass of a 12C atom.

Illustrated Glossary of Organic Chemistry Atomic mass unit (amu; dalton): A unit of mass equal to exactly 1/12 the mass of one 12C atom, or 1.660538921 x 10−27 kg. This is the approximate mass of one [..]

By definition, 1/12 the mass of a carbon-12 atom.