Flap may refer to:

Arts, entertainment, and media

* ''Flap'' (film), a 1970 American film * Flap, a boss character in the arcade game ''

Gaiapolis is a 1993 action role-playing video game developed and released for arcades by Konami. The plot follows prince Gerard Himerce, whose country was destroyed by Mordred, an evil god summoned by the king Darkness of the Zah Harc empire. Gerard emba ...

'' * Flap, a minor character in the film '' Little Nemo: Adventures in Slumberland''

Biology and healthcare

Flap (surgery) Flap surgery is a technique in plastic surgery, plastic and reconstructive surgery where Tissue (biology), tissue with an intact blood supply is lifted from a donor site and moved to a recipient site. Flaps are distinct from Graft (surgery), graf ...

, a surgical technique involving movement of vascularized tissue **

Free flap The terms free flap, free autologous tissue transfer and microvascular free tissue transfer are synonymous terms used to describe the "transplantation" of tissue from one site of the body to another, in order to reconstruct an existing defect. ...

, a specific kind of surgical flap *

Flapping tremor Asterixis (more colloquially referred to as flapping tremor) is not actually a tremor, but rather a negative myoclonus. This movement disorder is characterized by an inability to maintain a position, which is demonstrated by jerking movements of th ...

is a medical condition, also called asterixis * 5-lipoxygenase activating protein (FLAP)

Computing and networks

* The phenomenon of some variable or resource

oscillating Oscillation is the repetitive or periodic variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states. Familiar examples of oscillation include a swinging pendulum ...

or alternating rapidly between two

states State most commonly refers to: * State (polity), a centralized political organization that regulates law and society within a territory **Sovereign state, a sovereign polity in international law, commonly referred to as a country **Nation state, a ...

Route flapping In computer networking and telecommunications Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information over a distance using electronic means, typically through cables, radio waves, or ...

, when a network router flips between different routes **

Link flap Link flap is a condition where a communications link alternates between ''up'' and ''down'' states. Link flap can be caused by end station reboots, power-saving features, incorrect duplex configuration or marginal connections, and signal integrit ...

, errant behavior in a communications link

Engineering and design

Flap (aeronautics) A flap is a high-lift device used to reduce the stalling speed of an aircraft wing at a given weight. Flaps are usually mounted on the wing trailing edges of a fixed-wing aircraft. Flaps are used to reduce the take-off distance and the landi ...

, a lift augmentation device on an airplane wing, often near the trailing edge * Flapping, the up-and-down motion of a

helicopter rotor On a helicopter, the main rotor or rotor system is the combination of several rotary wings (rotor blades) with a control system, that generates the aerodynamic lift (force), lift force that supports the weight of the helicopter, and the thrust ...

* Flap, any hinged plate often used as a cover or a simple one-way

valve A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or Slurry, slurries) by opening, closing, or partially obstructing various passageways. Valves are technically Pip ...

Sluice A sluice ( ) is a water channel containing a sluice gate, a type of lock to manage the water flow and water level. There are various types of sluice gates, including flap sluice gates and fan gates. Different depths are calculated when design s ...

or flap gate, a pressure driven water flow control device between a channel and other water body **

Bum flap The term bum flap or butt flap refers in one usage to the rear flap in a union suit, In this usage, it is also sometimes termed as ''crap flap'', ''evacuation flap'', or with some other euphemism. In another usage ( train hopping), the term refers ...

(or butt flap), a separately removable part of underwear (un)covering the buttocks **

Mudflap A mudflap or mud guard is used in combination with the vehicle fender to protect the vehicle, passengers, other vehicles, and pedestrians from mud and other flying debris thrown into the air by a rotating tire on a wheeled vehicle. A mudflap is ...

, a guard for tires **

Pet door A pet door or pet flap (also referred to in more specific terms, such as cat flap, cat door, kitty door, dog flap, dog door, or doggy/doggie door) is a small opening to allow pets to enter and exit a building on their own without needing a human t ...

or pet flap *

Roof flap A roof flap is an aerodynamic feature on race cars, mainly stock cars, which functions as an emergency spoiler to prevent the vehicle from lifting off the ground. The flaps are stowed during normal vehicle operation; however, in certain situation ...

, an aerodynamic feature of race cars

Linguistics

Flap consonant In phonetics, a flap or tap is a type of consonantal sound, which is produced with a single contraction of the muscles so that one articulator (such as the tongue) is thrown against another. Contrast with stops and trills The main difference be ...

, a sound produced by brief contact between one articulator (such as the tongue) and another (such as the roof of the mouth) **

Flapping Flapping or tapping, also known as alveolar flapping, intervocalic flapping, or ''t''-voicing, is a phonological process involving a voiced alveolar tap or flap; it is found in many varieties of English, especially North American, Cardiff, Uls ...

, a process by which a or a before an unstressed vowel is pronounced as a flap consonant

Other uses

* Flapping, one of the basic mechanics of

bird flight Bird flight is the primary mode of animal locomotion, locomotion used by most bird species in which birds take off and flight, fly. Flight assists birds with feeding, Sexual reproduction, breeding, avoiding predation, predators, and Bird migrati ...