- (physics and astrophysics) An order or factor of ten. Used both to refer to the function and the number of (possibly fractional) orders of magnitude separating two numbers. When dealing with log to the base 10 transform of a number set the transform of 10, 100, and 1 000 000 is , and , so the difference between 10 and 100 in base 10 is 1 dex and the difference between 1 and 1 000 000 is 6 dex.
Contraction of "decimal exponent".
- (informal) dextromethorphan
- (in the names of some pharmaceutical drugs) Alternative form of dextro-.; denoting a dextrorotatory form.