1. [n]  hanging cloth used as a blind
2. [n]  any barrier to communication or vision; "a curtain of secrecy"; "a curtain of trees"
3. [v]  provide with curtains, as of a room or a window

Curtain
In his final case, the indefatigable Hercule Poirot returns to Styles St. Mary, the site of his first case, to battle the most cunning and terrible villain of his career.

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1. \Cur"tain\ (k?r"t?n; 48), n. [OE. cortin, curtin,fr. OF.
   cortine, curtine, F. courtine, LL. cortina, curtian (in
   senses 1 and 2), also, small court, small inclosure
   surrounded by walls, from cortis court. See {Court}.]
   1. A hanging screen intended to darken or conceal, and
      admitting of being drawn back or up, and reclosed at
      pleasure; esp., drapery of cloth or lace hanging round a
      bed or at a window; in theaters, and like places, a
      movable screen for concealing the stage.
   2. (Fort.) That part of the rampart and parapet which is
      between two bastions or two gates. See Illustrations of
      {Ravelin} and {Bastion}.
   3. (Arch.) That part of a wall of a building which is between
      two pavilions, towers, etc.
   4. A flag; an ensign; -- in contempt. [Obs.] --Shak.
   {Behind the curtain}, in concealment; in secret.
   {Curtain lecture}, a querulous lecture given by a wife to her
      husband within the bed curtains, or in bed. --Jerrold.
            A curtain lecture is worth all the sermons in the
            world for teaching the virtues of patience and
            long-suffering.                       --W. Irving.
   {The curtain falls}, the performance closes.
   {The curtain rises}, the performance begins.
   {To draw the curtain}, to close it over an object, or to
      remove it; hence:
      (a) To hide or to disclose an object.
      (b) To commence or close a performance.
   {To drop the curtain}, to end the tale, or close the
      performance.
   

2. \Cur"tain\, v. t. [imp. & p. p. {Curtained} (-t?nd; 48);
   p. pr. & vb. n. {Curtaining}.]
   To inclose as with curtains; to furnish with curtains.
         So when the sun in bed Curtained with cloudy red.
                                                  --Milton.
   

(1.) Ten curtains, each twenty-eight cubits long and four wide, made of fine linen, also eleven made of goat's hair, covered the tabernacle (Ex. 26:1-13; 36:8-17).

(2.) The sacred curtain, separating the holy of holies from the sanctuary, is designated by a different Hebrew word (peroketh). It is described as a "veil of blue, and purple, and scarlet, and fine twined linen of cunning work" (Ex. 26:31; Lev. 16:2; Num. 18:7).

(3.) "Stretcheth out the heavens as a curtain" (Isa. 40:22), is an expression used with reference to the veil or awning which Orientals spread for a screen over their courts in summer. According to the prophet, the heavens are spread over our heads as such an awning. Similar expressions are found in Ps. 104:2l; comp. Isa. 44:24; Job 9:8.