This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Of, or relating to stoichiometry.

adj. Existing in a ratio of small integers.

adj. Of or pertaining to stoichiometry; employed in, or obtained by, stoichiometry.

adj. of, pertaining to, using, or consuming, reagents in the exact proportions required for a given reaction.

adj. of or relating to stoichiometry

"The first item on the list should be advanced studies and prototypes for stoichiometric mixture ratio rocket engines."

stoichiometrical   

air/fuel    free-radical    fuel/air    dimensionless    eutectic