Definitions

from the GNU version of the Collaborative International Dictionary of English

  • n. An airplane with four superposed main supporting surfaces. Contrasted with triplane biplane and monoplane. They are now used only for hobbyist or historical activities.

from The Century Dictionary and Cyclopedia

  • n. A plane quadrilateral having its opposite or alternate sides equal and one pair of these crossing each other.
  • n. A system of four plane links pivoted together so that the pivots are vertexes of a contraparallelogram. It is an extension by Sylvester and Kempe of what Sylvester called the plagiograph or skew-pantograph to Hart's contraparallelogram.

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