Source : Webster's Revised Unabridged Dictionary (1913)

Plait \Plait\, n. [OE. playte, OF. pleit, L. plicatum, plicitum,
   p. p. of plicare to fold, akin to plectere to plait. See
   {Ply}, and cf. {Plat} to weave, {Pleat}, {Plight} fold.]
   1. A flat fold; a doubling, as of cloth; a pleat; as, a box
      plait.

            The plaits and foldings of the drapery. --Addison.

   2. A braid, as of hair or straw; a plat.

   {Polish plait}. (Med.) Same as {Plica}.

Plica \Pli"ca\, n. [LL., a fold, fr. L. plicare to fold. See
   {Ply}, v.]
   1. (Med.) A disease of the hair (Plica polonica), in which it
      becomes twisted and matted together. The disease is of
      Polish origin, and is hence called also {Polish plait}.
      --Dunglison.

   2. (Bot.) A diseased state in plants in which there is an
      excessive development of small entangled twigs, instead of
      ordinary branches.

   3. (Zo["o]l.) The bend of the wing of a bird.