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Definition of Law of definite proportions
1. Noun. (chemistry) law stating that every pure substance always contains the same elements combined in the same proportions by weight.
Exact synonyms: Law Of Constant Proportion
Generic synonyms: Law, Law Of Nature
Category relationships: Chemical Science, Chemistry
Generic synonyms: Law, Law Of Nature
Category relationships: Chemical Science, Chemistry
Medical Definition of Law of definite proportions
1. The relative weights of the several elements forming a chemical compound are invariable. Synonym: Proust's law. (05 Mar 2000)