(mineralogy) A monoclinic-prismatic mineral containing hydrogen, iron, oxygen, and phosphorus.

plural of El Niño

A number of places in England: / A number of places in the United States: / (countable) A habitational surname from Old English. / (countable) A male given name transferred from the surname.

(geometry) A circle defined as the intersection of the surface of a sphere and a plane which passes through the centre of the sphere.