The Collaborative International Dictionary of English v.0.48:

Crater \Cra"ter\ (kr[=a]"t[~e]r), n. [L. crater, cratera, a
   mixing vessel, the mouth of a volcano, Gr. krath`r, fr.
   keranny`nai to mix; cf. Skr. [,c]r[imac] to mix, [,c]ir to
   cook, [,c]r[=a] to cook. Cf. Grail, in Holy Grail.]
   1. The basinlike opening or mouth of a volcano, through which
      the chief eruption comes; similarly, the mouth of a
      geyser, about which a cone of silica is often built up.
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   2. (Mil.) The pit left by the explosion of a bomb, shell, or
      mine.
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   3. (Astron.) A constellation of the southen hemisphere; --
      called also the Cup.
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The Collaborative International Dictionary of English v.0.48:

Cup \Cup\ (k[u^]p), n. [AS. cuppe, LL. cuppa cup; cf. L. cupa
   tub, cask; cf. also Gr. ky`ph hut, Skr. k[=u]pa pit, hollow,
   OSlav. kupa cup. Cf. Coop, Cupola, Cowl a water vessel,
   and Cob, Coif, Cop.]
   1. A small vessel, used commonly to drink from; as, a tin
      cup, a silver cup, a wine cup; especially, in modern
      times, the pottery or porcelain vessel, commonly with a
      handle, used with a saucer in drinking tea, coffee, and
      the like.
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   2. The contents of such a vessel; a cupful.
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            Give me a cup of sack, boy.           --Shak.
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   3. pl. Repeated potations; social or excessive indulgence in
      intoxicating drinks; revelry.
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            Thence from cups to civil broils.     --Milton.
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   4. That which is to be received or indured; that which is
      allotted to one; a portion.
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            O my Father, if it be possible, let this cup pass
            from me.                              --Matt. xxvi.
                                                  39.
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   5. Anything shaped like a cup; as, the cup of an acorn, or of
      a flower.
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            The cowslip's golden cup no more I see. --Shenstone.
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   6. (Med.) A cupping glass or other vessel or instrument used
      to produce the vacuum in cupping.
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   Cup and ball, a familiar toy of children, having a cup on
      the top of a piece of wood to which, a ball is attached by
      a cord; the ball, being thrown up, is to be caught in the
      cup; bilboquet. --Milman.

   Cup and can, familiar companions.

   Dry cup, Wet cup (Med.), a cup used for dry or wet
      cupping. See under Cupping.

   To be in one's cups, to be drunk.
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The Collaborative International Dictionary of English v.0.48:

Cup \Cup\, v. t. [imp. & p. p. Cupped (k[u^]pt); p. pr. & vb.
   n. Cupping.]
   1. To supply with cups of wine. [R.]
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            Cup us, till the world go round.      --Shak.
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   2. (Surg.) To apply a cupping apparatus to; to subject to the
      operation of cupping. See Cupping.
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   3. (Mech.) To make concave or in the form of a cup; as, to
      cup the end of a screw.
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WordNet (r) 3.0 (2006):

cup
    n 1: a small open container usually used for drinking; usually
         has a handle; "he put the cup back in the saucer"; "the
         handle of the cup was missing"
    2: the quantity a cup will hold; "he drank a cup of coffee"; "he
       borrowed a cup of sugar" [syn: cup, cupful]
    3: any cup-shaped concavity; "bees filled the waxen cups with
       honey"; "he wore a jock strap with a metal cup"; "the cup of
       her bra"
    4: a United States liquid unit equal to 8 fluid ounces
    5: cup-shaped plant organ
    6: a punch served in a pitcher instead of a punch bowl
    7: the hole (or metal container in the hole) on a golf green;
       "he swore as the ball rimmed the cup and rolled away"; "put
       the flag back in the cup"
    8: a large metal vessel with two handles that is awarded as a
       trophy to the winner of a competition; "the school kept the
       cups is a special glass case" [syn: cup, loving cup]
    v 1: form into the shape of a cup; "She cupped her hands"
    2: put into a cup; "cup the milk"
    3: treat by applying evacuated cups to the patient's skin [syn:
       cup, transfuse]