(mineralogy) Any of the rock-forming minerals pyroxene, amphibole, and mica.

(medicine) normal development or growth of an organ, without hyperplasia or hypoplasia

A difference between the value of a function evaluated at a number, and the value of the same function evaluated at a different number, a fixed distance from the first.

Capra aegagrus hircus, a breed of goat originating from Galicia.