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plaint an expression of unhappiness; complaint. [2 definitions]
plain text data consisting only of text encoded in ASCII, hence as characters and spaces with no options for how they appear, making it a highly portable, compact file format.
plaintiff one who initiates a lawsuit against another. (Cf. defendant.)
plaintive showing or expressing sadness or sorrow.
plait strands, as of hair or cloth, woven together; braid. [5 definitions]
plan an intended action; aim. [6 definitions]
planar of or concerning a flat surface or plane. [2 definitions]
planarian any of various free-moving aquatic flatworms having small, broad bodies and a three-part intestinal tract.
planchet a small piece of blank metal onto which a coin will be stamped.
planchette a small platform, as on a Ouija board, on which the fingertips rest, their slight pressure causing the platform to move and spell out words with an attached pencil or by pointing to letters.
Planck's constant the fundamental constant in quantum mechanics that expresses the ratio of the radiant energy of one quantum to the frequency of radiation.
plane1 a flat or level surface. [7 definitions]
plane2 any of various carpentry tools with an adjustable blade, used to make surfaces of wood smooth, true, grooved, or the like. [3 definitions]
plane geometry the geometry of two-dimensional or planar figures.
planer a person or thing that planes, esp. a machine that cuts or smooths wood.
planer tree a small elm tree with ovate leaves and bearing a small, nutlike fruit which grows in moist areas of the southeast United States.
planet a large, nonluminous celestial body, esp. one of the nine in the solar system, that revolves around a star and often has one or more satellites. [2 definitions]
planetable combined form of planet.
plane table a portable drawing board mounted on a tripod which is used by surveyors in the field.
planetarium an apparatus that projects a representation of the stars, planets, and the like, usu. upon a dome-shaped ceiling. [3 definitions]
planetary of, concerning, or like a planet or planets. [3 definitions]