noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations). uncountable
2. 2
   (chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers) wordnet
3. 3
   The quantitative relationship between the reactants and products of a specific reaction or equation. countable

Etymology

Coined as German Stöchiometrie by Jeremias Benjamin Richter in 1792. From Ancient Greek στοιχεῖον (stoikheîon, “element”) + -metry.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.