(geology) A large underground pool of molten rock lying under the surface of the earth's crust.

(euphemistic, obsolete) Sex; fornication. / The work of a chambermaid.

A vessel filled with a superheated transparent liquid (most often liquid hydrogen) used to detect electrically charged particles moving through it.

A vessel containing air at an elevated pressure, especially one used to administer oxygen to a patient

A musical ensemble of modest size, to play chamber music; can be more specifically named after its number (from duo to nonet) and/or type(s) (e.g. wood, brass, strings) of instruments.

(idiomatic) A forbidden room.

(historical, cryptography, informal) A government or royal court's cryptanalyst department.

(derogatory) a legal or administrative body with strict, arbitrary rulings and secretive proceedings

The need to make a decision between alternatives that are both desirable.

Alternative form of champagne taste on a beer budget