noun (ejection seat, ejection seats)
- A seat in an aircraft which can be ejected from the cockpit and thus save the pilots life when a crash is imminent.
noun <!-- Note: If you edit this, don't change position of Silo, it is referenced there as definition 2 in elevator
- Platform used for the moving of people and/or goods up and down in buildings.
- A silo used for storing wheat, corn or other grain (grain elevator)
- A control surface of an aircraft responsible for controling the pitching motion of the machine.
- Trademark for a type of shoe having an insert lift to make the wearer appear taller.
- a moveable surface at the trailing edge of a tailless airplane (such as the space shuttle) that provides pitch and roll control
- The tail assembly of an aircraft.
- The feathers of an arrow or the tail fins of a bomb or rocket used to stabilize the longitudinal axis of the projectile parallel to the flight path.
noun (plural envelopes)
- A paper or cardboard wrapper used to enclose and small, flat items, especially letters, for mailing.
- Something that envelops; a wrapping
- A bag containing the lifting gas of a balloon or airship.
- (geometry) A mathematical curve, surface, or higher-dimensional object that is the tangent to a given family of lines, curves, surfaces, or higher-dimensional objects.
- (electronics) A curve that bounds another curve or set of curves, as the modulation envelope of an amplitude-modulated carrier wave in electronics.
- (music) The shape of a sound, which may be controlled by a synthesizer or sampler.
- (computing) The information used for routing an email that is transmitted with the email but not part of its contents.
- (biology) An enclosing structure or cover, such as a membrane.
- (engineering) The set of limitations within which a technological system can perform safely and effectively.