A neighborhood on the southern edge of downtown Boston that included numerous bars, peep shows, pornography vendors, and prostitution.

A theoretical orbital zone around a star that will result in an Earth-like planet existing in an orbit in the zone having a runaway greenhouse effect, similar to that found on Venus in our Solar System. The inner edge of the zone is where solar radiation is intense enough to strip the atmosphere of a planet away. The outer edge is where solar radiation is insufficient to power a runaway greenhouse.

(geology, often humorous, by analogy to erogenous zone) A region characterized by mountain-building.

(chiefly US, idiomatic, sports) To fill a relevant region of the field of play. / (idiomatic, by extension) To provide a very large quantity (of something).

(military) The area of engagement where an attack on the enemy is focused and which has the highest percentage of fatalities. / A position where an individual is facing a deadly attack.

A feature of some volcanoes, especially the shield volcanoes of Hawaii, in which a linear series of fissures in the volcanic edifice allows lava to erupt from the volcano's flank instead of from its summit.

(law) A type of zoning ordinance regulating average density rather than the size of each lot, generally requiring some amount of shared open space.

A district of Baghdad, Iraq: A fortified high-security district of Baghdad; established by the United States occupation force in the wake of the U.S.-Iraq War invasion of 2003; which contains major international hotels, international organizations and forces headquarters, Iraqi national ministries and government offices, and VIP residences.

(historical) A former area between Saudi Arabia and Iraq, abolished 1991.

An area with no life. / (ecology) An area of the ocean where oxygen levels are too low to support life, especially as a result of pollution.