/stoy'kee om"i tree/ , n.
1. the calculation of the quantities of chemical elements or compounds involved in chemical reactions.
2. the branch of chemistry dealing with relationships of combining elements, esp. quantitatively.
Also, stoicheiometry /stoy'kuy om"i tree/ .
[ 1800-10; stoicheîo ( n ) (see STOICHIOMETRIC) + -METRY ]