Source : Webster's Revised Unabridged Dictionary (1913)

Arris \Ar"ris\, n. [OF. areste, F. ar[^e]te, fr. L. arista the
   top or beard of an ear of grain, the bone of a fish.] (Arch.)
   The sharp edge or salient angle formed by two surfaces
   meeting each other, whether plane or curved; -- applied
   particularly to the edges in moldings, and to the raised
   edges which separate the flutings in a Doric column. --P.
   Cyc.

   {Arris fillet}, a triangular piece of wood used to raise the
      slates of a roof against a chimney or wall, to throw off
      the rain. --Gwilt.

   {Arris gutter}, a gutter of a V form fixed to the eaves of a
      building. --Gwilt.

Fillet \Fil"let\, n. [OE. filet, felet, fr. OF. filet thread,
   fillet of meat, dim. of fil a thread, fr. L. filum. See
   {Fille} a row.]
   1. A little band, especially one intended to encircle the
      hair of the head.

            A belt her waist, a fillet binds her hair. --Pope.

   2. (Cooking) A piece of lean meat without bone; sometimes, a
      long strip rolled together and tied.

   Note: A fillet of beef is the under side of the sirlom; also
         called tenderloin. A fillet of veal or mutton is the
         fleshy part of the thigh. A fillet of fish is a slice
         of flat fish without bone. ``Fillet of a fenny snake.''
         --Shak.

   3. A thin strip or ribbon; esp.:
      (a) A strip of metal from which coins are punched.
      (b) A strip of card clothing.
      (c) A thin projecting band or strip.

   4. (Mach.) A concave filling in of a re["e]ntrant angle where
      two surfaces meet, forming a rounded corner.

   5. (Arch.) A narrow flat member; especially, a flat molding
      separating other moldings; a reglet; also, the space
      between two flutings in a shaft. See Illust. of {Base},
      and {Column}.

   6. (Her.) An ordinary equaling in breadth one fourth of the
      chief, to the lowest portion of which it corresponds in
      position.

   7. (Mech.) The thread of a screw.

   8. A border of broad or narrow lines of color or gilt.

   9. The raised molding about the muzzle of a gun.

   10. Any scantling smaller than a batten.

   11. (Anat.) A fascia; a band of fibers; applied esp. to
       certain bands of white matter in the brain.

   12. (Man.) The loins of a horse, beginning at the place where
       the hinder part of the saddle rests.

   {Arris fillet}. See under {Arris}.