The Collaborative International Dictionary of English v.0.48:

Cramp \Cramp\ (kr[a^]mp), n. [OE. crampe, craumpe; akin to D. &
   Sw. kramp, Dan. krampe, G. krampf (whence F. crampe), Icel.
   krappr strait, narrow, and to E. crimp, crumple; cf. cram.
   See Grape.]
   1. That which confines or contracts; a restraint; a shackle;
      a hindrance.
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            A narrow fortune is a cramp to a great mind.
                                                  --L'Estrange.
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            Crippling his pleasures with the cramp of fear.
                                                  --Cowper.
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   2. (Masonry) A device, usually of iron bent at the ends, used
      to hold together blocks of stone, timbers, etc.; a cramp
      iron.
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   3. (Carp.) A rectangular frame, with a tightening screw, used
      for compressing the joints of framework, etc.
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   4. A piece of wood having a curve corresponding to that of
      the upper part of the instep, on which the upper leather
      of a boot is stretched to give it the requisite shape.
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   5. (Med.) A spasmodic and painful involuntary contraction of
      a muscle or muscles, as of the leg.
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            The cramp, divers nights, gripeth him in his legs.
                                                  --Sir T. More.
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   6. (Med.) A paralysis of certain muscles due to excessive
      use; as, writer's cramp; milker's cramp, etc.
      [Webster 1913 Suppl.]

   Cramp bone, the patella of a sheep; -- formerly used as a
      charm for the cramp. --Halliwell. "He could turn cramp
      bones into chess men." --Dickens.

   Cramp ring, a ring formerly supposed to have virtue in
      averting or curing cramp, as having been consecrated by
      one of the kings of England on Good Friday.
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The Collaborative International Dictionary of English v.0.48:

Cramp \Cramp\, v. t. [imp. & p. p. Cramped (kr[a^]mt; 215); p.
   pr. & vb. n. Cramping.]
   1. To compress; to restrain from free action; to confine and
      contract; to hinder.
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            The mind my be as much cramped by too much knowledge
            as by ignorance.                      --Layard.
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   2. To fasten or hold with, or as with, a cramp.
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   3. Hence, to bind together; to unite.
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            The . . . fabric of universal justic is well cramped
            and bolted together in all its parts. --Burke.
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   4. To form on a cramp; as, to cramp boot legs.
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   5. To afflict with cramp.
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            When the gout cramps my joints.       --Ford.
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   To cramp the wheels of wagon, to turn the front wheels out
      of line with the hind wheels, so that one of them shall be
      against the body of the wagon.
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The Collaborative International Dictionary of English v.0.48:

Cramp \Cramp\, a. [See Cramp, n.]
   Knotty; difficult. [R.]
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         Care being taken not to add any of the cramp reasons
         for this opinion.                        --Coleridge.
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WordNet (r) 3.0 (2006):

cramp
    n 1: a painful and involuntary muscular contraction [syn:
         spasm, cramp, muscle spasm]
    2: a clamp for holding pieces of wood together while they are
       glued
    3: a strip of metal with ends bent at right angles; used to hold
       masonry together [syn: cramp, cramp iron]
    v 1: secure with a cramp; "cramp the wood"
    2: prevent the progress or free movement of; "He was hampered in
       his efforts by the bad weather"; "the imperialist nation
       wanted to strangle the free trade between the two small
       countries" [syn: hamper, halter, cramp, strangle]
    3: affect with or as if with a cramp
    4: suffer from sudden painful contraction of a muscle