from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See atomic mass unit.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. the atomic mass unit
from the GNU version of the Collaborative International Dictionary of English
- n. John Dalton, scientist, born 1766, died 1844.
- n. a unit of mass, approximately 1.66 x 10-24 grams; -- it is approximately equal to the mass of one hydrogen atom, but the exact value differs slightly as used in physics and chemistry. It is used mostly to describe the size of proteins and nucleic acids in biochemistry.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. English chemist and physicist who formulated atomic theory and the law of partial pressures; gave the first description of red-green color blindness (1766-1844)
After John Dalton.(American Heritage® Dictionary of the English Language, Fourth Edition)