資料來源 : Webster's Revised Unabridged Dictionary (1913)

Perspective \Per*spec"tive\, a. [L. perspicere, perspectum, to
   look through; per + spicere, specere, to look: cf. F.
   perspectif; or from E. perspective, n. See {Spy}, n.]
   1. Of or pertaining to the science of vision; optical. [Obs.]
      --Bacon.

   2. Pertaining to the art, or in accordance with the laws, of
      perspective.

   {Perspective plane}, the plane or surface on which the
      objects are delineated, or the picture drawn; the plane of
      projection; -- distinguished from the ground plane, which
      is that on which the objects are represented as standing.
      When this plane is oblique to the principal face of the
      object, the perspective is called oblique perspective;
      when parallel to that face, parallel perspective.

   {Perspective shell} (Zo["o]l.), any shell of the genus
      {Solarium} and allied genera. See {Solarium}.

Plane \Plane\, n. [F. plane, L. plana. See {Plane}, v. & a.]
   1. (Geom.) A surface, real or imaginary, in which, if any two
      points are taken, the straight line which joins them lies
      wholly in that surface; or a surface, any section of which
      by a like surface is a straight line; a surface without
      curvature.

   2. (Astron.) An ideal surface, conceived as coinciding with,
      or containing, some designated astronomical line, circle,
      or other curve; as, the plane of an orbit; the plane of
      the ecliptic, or of the equator.

   3. (Mech.) A block or plate having a perfectly flat surface,
      used as a standard of flatness; a surface plate.

   4. (Joinery) A tool for smoothing boards or other surfaces of
      wood, for forming moldings, etc. It consists of a
      smooth-soled stock, usually of wood, from the under side
      or face of which projects slightly the steel cutting edge
      of a chisel, called the iron, which inclines backward,
      with an apperture in front for the escape of shavings; as,
      the jack plane; the smoothing plane; the molding plane,
      etc.

   {Objective plane} (Surv.), the horizontal plane upon which
      the object which is to be delineated, or whose place is to
      be determined, is supposed to stand.

   {Perspective plane}. See {Perspective}.

   {Plane at infinity} (Geom.), a plane in which points
      infinitely distant are conceived as situated.

   {Plane iron}, the cutting chisel of a joiner's plane.

   {Plane of polarization}. (Opt.) See {Polarization}.

   {Plane of projection}.
      (a) The plane on which the projection is made,
          corresponding to the perspective plane in perspective;
          -- called also principal plane.
      (b) (Descriptive Geom.) One of the planes to which points
          are referred for the purpose of determining their
          relative position in space.

   {Plane of refraction} or {reflection} (Opt.), the plane in
      which lie both the incident ray and the refracted or
      reflected ray.