A substance that is a product of ordinary metabolism and not produced for a specific purpose, but acts like a hormone in modifying the activity of some distant organ, as in the case of carbon dioxi...

Any mosquito or midge of the dipteran superfamily Culicoidea

(mineralogy) A trigonal-hexagonal scalenohedral black mineral containing iron, niobium, oxygen, tantalum, and uranium.

A census-designated place, the county seat of Alpine County, California, United States.