molecular mass
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mo·lec·u·lar weight (mol wt, MW),
the sum of the atomic weights of all the atoms constituting a molecule; the mass of a molecule relative to the mass of a standard atom, now 12C (taken as 12.000). Relative molecular mass (Mr) is the mass relative to the dalton and has no units.
See also: atomic weight.
See also: atomic weight.
Farlex Partner Medical Dictionary © Farlex 2012
mass
(mas) [L. massa, mass fr Gr. maza, (barley) cake]1. A quantity of material, such as cells, that unite or adhere to each other.
2. Soft solid preparation for internal use and of such consistency that it may be molded into pills.
3. A fundamental scalar property of an object that describes the amount of acceleration an object will have when a given force is applied to it. The metric unit of mass is the kilogram. One kilogram equals 2.205 pounds. See: weight
4. Large, extensive, or encompassing an entire organ or population group (e.g., a mass vaccination).
cell mass
In embryology, the mass of cells that develops into an organ or structure.
epithelial mass
The inner portion of a developing gonad enclosed within the germinal epithelium.
fat mass
Total body fat. It can be measured with dual energy absorptiometry or bioelectrical impedance techniques.
fat-free mass
The lean body mass plus the skeletal mass.
formula mass
Gram molecular mass.gram molecular mass
The mass or weight in grams of a substance equal to its molecular mass/weight.
Synonym: formula mass; gram molecular weightinner cell mass
In embryology, the group of cells within the blastocyst from which the embryo, yolk sac, and amnion develop.
See: blastocystintermediate cell mass
A plate of nonsegmented mesoderm lying lateral to the segments (somites) and connecting them to the nonsegmented lateral mesoderm. Synonym: nephrotome
lateral mass of the atlas
The parts of the first cervical vertebra that articulate with the occipital bone superiorly and the axis inferiorly.
lean body mass
The weight of the body minus the fat content. It includes bones, muscles, and internal organs.
molecular mass
Molecular weight.Medical Dictionary, © 2009 Farlex and Partners