from the GNU version of the Collaborative International Dictionary of English
- adj. the essential law of chemical combination that every definite compound always contains the same elements in the same proportions by weight; and, if two or more elements form more than one compound with each other, the relative proportions of each are fixed. Compare Law of multiple proportions, under Multiple.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (chemistry) law stating that every pure substance always contains the same elements combined in the same proportions by weight
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