(sports, jargon) A group in a multi-stage tournament which is unusually competitive, because the number of strong competitors in the group is greater than the number of qualifying places available for the next phase of the tournament.

(anatomy) That volume of conducting airways of the lung, as measured by a cast of the airways.

(physiology) The volume of air in the alveoli of the lung which does not partake in the exchange of gas.

plural of dead zone

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.

plural of death wish

plural of screen of death

(computing, informal) A screen or a message indicating an unrecoverable error.

An agreement between a movie production studio and various other stakeholders for the production of a movie, usually based on some source material or other intellectual property created or owned by one or more of the stakeholders.

Used other than figuratively or idiomatically: see drug, deal.