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mass (mas)   a lump or collection of cohering particles.
  that characteristic of matter that gives it inertia. Symbol m.
 

atomic mass  atomic weight; see also atomic mass unit.

inner cell mass  embryoblast.

lean body mass  that part of the body including all its components except neutral storage lipid; in essence, the fat-free mass of the body.

relative molecular mass  technically preferable term for molecular weight.





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