Of or relating to rationalism.

(physiology) The speed of metabolism.

(physiology) The amount of energy expended while at rest in a neutrally temperate environment, in the post-absorptive state.

(statistics) A variable with the features of interval variable and, additionally, whose any two values have meaningful ratio, making the operations of multiplication and division meaningful.

(slang, dated, World War I) A fussy or overly zealous military superior.

In a rationalistic manner; in the context of rationalism

the air kerma per unit time.

Rat poison; white arsenic.

(finance) An estimate, based on a company, government or person's history of borrowing and repayment or available financial resources, that is used by creditors to determine the maximum amount of credit that can be extended without undue risk.

(sciences) A figure of merit comparing the strength of a signal carrying information to the noise interfering with it.