battery cage
n.— «Proposition 2, co-sponsored by the Humane Society and Farm Sanctuary, the biggest farm-animal-rights group in the United States, focuses on what are considered the worst animal-confinement systems in factory farms.…It would eliminate so-called battery cages where four or more hens share a space about the size of a file drawer.» —“The Barnyard Strategist” by Maggie Jones New York Times Magazine Oct. 24, 2008. (source: Double-Tongued Dictionary)