资料来源 : Webster's Revised Unabridged Dictionary (1913)

   {Bow pen}. See {Bow-pen}.

   {Dotting pen}, a pen for drawing dotted lines.

   {Drawing}, or {Ruling}, {pen}, a pen for ruling lines having
      a pair of blades between which the ink is contained.

   {Fountain pen}, {Geometric pen}. See under {Fountain}, and
      {Geometric}.

   {Music pen}, a pen having five points for drawing the five
      lines of the staff.

   {Pen and ink}, or {pen-and-ink}, executed or done with a pen
      and ink; as, a pen and ink sketch.

   {Pen feather}. A pin feather. [Obs.]

   {Pen name}. See under {Name}.

   {Sea pen} (Zo["o]l.), a pennatula. [Usually written
      {sea-pen}.]

Geometric \Ge`o*met"ric\, Geometrical \Ge`o*met"ric*al\, a. [L.
   geometricus; Gr. ?: cf. F. g['e]om['e]trique.]
   Pertaining to, or according to the rules or principles of,
   geometry; determined by geometry; as, a geometrical solution
   of a problem.

   Note: Geometric is often used, as opposed to algebraic, to
         include processes or solutions in which the
         propositions or principles of geometry are made use of
         rather than those of algebra.

   Note: Geometrical is often used in a limited or strictly
         technical sense, as opposed to mechanical; thus, a
         construction or solution is geometrical which can be
         made by ruler and compasses, i. e., by means of right
         lines and circles. Every construction or solution which
         requires any other curve, or such motion of a line or
         circle as would generate any other curve, is not
         geometrical, but mechanical. By another distinction, a
         geometrical solution is one obtained by the rules of
         geometry, or processes of analysis, and hence is exact;
         while a mechanical solution is one obtained by trial,
         by actual measurements, with instruments, etc., and is
         only approximate and empirical.

   {Geometrical curve}. Same as {Algebraic curve}; -- so called
      because their different points may be constructed by the
      operations of elementary geometry.

   {Geometric lathe}, an instrument for engraving bank notes,
      etc., with complicated patterns of interlacing lines; --
      called also {cycloidal engine}.

   {Geometrical pace}, a measure of five feet.

   {Geometric pen}, an instrument for drawing geometric curves,
      in which the movements of a pen or pencil attached to a
      revolving arm of adjustable length may be indefinitely
      varied by changing the toothed wheels which give motion to
      the arm.

   {Geometrical plane} (Persp.), the same as {Ground plane} .

   {Geometrical progression}, {proportion}, {ratio}. See under
      {Progression}, {Proportion} and {Ratio}.

   {Geometrical radius}, in gearing, the radius of the pitch
      circle of a cogwheel. --Knight.

   {Geometric spider} (Zo["o]l.), one of many species of
      spiders, which spin a geometrical web. They mostly belong
      to {Epeira} and allied genera, as the garden spider. See
      {Garden spider}.

   {Geometric square}, a portable instrument in the form of a
      square frame for ascertaining distances and heights by
      measuring angles.

   {Geometrical staircase}, one in which the stairs are
      supported by the wall at one end only.

   {Geometrical tracery}, in architecture and decoration,
      tracery arranged in geometrical figures.