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Ad Hoc Network: A group of stations that is formed for a special purpose, such as the showing of a one-time TV program or series. Ad hoc is Latin for 'for this.'

Palladium (Pd): Atomic number: 46, Atomic mass: 106.42 g.mol -1, Electronegativity: 2.2, Density: 11.9 g.cm-3 at 20°C, Melting point: 1560 °C, Boiling point: 2927 °C, Isotopes: 9, Vanderwaals radius: 0.065 . . . View Full Definition

Palisade: Layer of mesophyll cells in leaves that are closely placed together under the epidermal layer of the leaf. Palisade parenchyma: Columnar cells located just below the upper epidermis in leave . . . View Full Definition

Padmasana : Lotus pose - a seated meditative posture.

Paddle: Atari 2600 controllers that consist of a knob that can turn and a single fire button. These controllers allow for precise side-to-side movements.

Pan And Tilt Head: Tripod head allowing the camera to be tilted up and down or turned through a 360° arc.

Panhead: Panhead is the name of the Harley-Davidson engine used from 1948-1965. The chromed rocker covers resemble a baking or frying pan.

Paradigmatic Structure: In semiotics, a manner in which signs are organized and meaning created. Paradigmatic structures create meaning through association, in contrast to syntagmatic structures which create meanin . . . View Full Definition

Paradigmatic Change: In linguistics, these are language changes brought about because a sound or a word was associated with a different sound or word. Algeo provides the following example: . . . The side of a sh . . . View Full Definition

Paper Grade: Numerical and terminological description of paper contrast: numbers 0 - 1 soft: number 2 normal: number 3 hard: number 4 - 5 very hard: number 6 ultra hard. Similar grade number from differe . . . View Full Definition