(arithmetic) A fraction in the form of one integer divided by another, non-zero, integer.

(cytology) A thick-walled, drought-tolerant brood cell in protonemata of mosses of the genus Funaria

To slide down a hill on a toboggan or other object. / (figuratively) To go downhill unstoppably until one reaches the bottom.

(pharmacology) A generic term for drugs in a new class of third-generation erythropoiesis-stimulating agents (ESAs).