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plenipotentiary an agent given full authority to act on behalf of another, esp. in diplomatic matters. [4 definitions]
plenitude abundance; fullness. [2 definitions]
plenteous plentiful; abundant. [2 definitions]
plentiful existing in or producing large amounts or quantities; abundant.
plenty a full provision or supply. [4 definitions]
plenum a space that encloses a volume of gas at greater pressure than exists outside the space, or the state of the gas thus enclosed. [3 definitions]
pleo- more.
pleonasm the use of more words than are needed to express an idea; redundancy. [3 definitions]
plesiosaur an extinct marine reptile of the Mesozoic era having paddle-like limbs, a large flat body, and a short tail.
plethora an amount that is more than enough; overabundance. [2 definitions]
pleura the thin membranous sac that envelops each lung and lines the thorax in mammals.
pleural cavity a narrow, fluid-filled space between the two membranes of the pleura, also known as the pleural space.
pleurisy inflammation of the membrane lining the outer surface of the lungs.
Plexiglas trademark for a synthetic resinous thermoplastic that is lightweight and transparent and used for windows, lenses, and the like.
plexiglass a transparent plastic that is often used as a lightweight, shatterproof alternative to glass.
plexus a complex interwoven network.
pliable easily bent; flexible; malleable. [3 definitions]
pliant easily flexed; supple. [2 definitions]
plicate existing or arranged in fanlike folds; pleated.
plier a thing or person that plies. [2 definitions]
pliers any of various tools that have opposed handles and jaws connected by a pivot and that are used for holding, bending, or cutting wire, metal, or the like.