Wordnet 3.0
NOUN (1)
1. 
 the skin that covers the top of the head; 
- Example: "they wanted to take his scalp as a trophy"VERB (2)
1. 
 sell illegally, as on the black market; 
2. 
 remove the scalp of; 
- Example: "The enemies were scalped"
The Collaborative International Dictionary of English v.0.48:
Scalp \Scalp\ (sk[a^]lp), n. [Cf. Scallop.]
   A bed of oysters or mussels. [Scot.]
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Scalp \Scalp\, n. [Perhaps akin to D. schelp shell. Cf.
   Scallop.]
   1. That part of the integument of the head which is usually
      covered with hair.
      [1913 Webster]
            By the bare scalp of Robin Hodd's fat friar,
            This fellow were a king for our wild faction!
                                                  --Shak.
      [1913 Webster]
   2. A part of the skin of the head, with the hair attached,
      cut or torn off from an enemy by the Indian warriors of
      North America, as a token of victory.
      [1913 Webster]
   3. Fig.: The top; the summit. --Macaulay.
      [1913 Webster]
   Scalp lock, a long tuft of hair left on the crown of the
      head by the warriors of some tribes of American Indians.
      [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Scalp \Scalp\, v. t. [imp. & p. p. Scalped; p. pr. & vb. n.
   Scalping.]
   1. To deprive of the scalp; to cut or tear the scalp from the
      head of.
      [1913 Webster]
   2. (Surg.) To remove the skin of.
      [1913 Webster]
            We must scalp the whole lid [of the eye]. --J. S.
                                                  Wells.
      [1913 Webster]
   3. (Milling) To brush the hairs or fuzz from, as wheat
      grains, in the process of high milling. --Knight.
      [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Scalp \Scalp\, v. i.
   To make a small, quick profit by slight fluctuations of the
   market; -- said of brokers who operate in this way on their
   own account. [Cant]
   [1913 Webster]
WordNet (r) 3.0 (2006):
scalp
    n 1: the skin that covers the top of the head; "they wanted to
         take his scalp as a trophy"
    v 1: sell illegally, as on the black market
    2: remove the scalp of; "The enemies were scalped"
Moby Thesaurus II by Grady Ward, 1.0:
32 Moby Thesaurus words for "scalp":
   bark, be caught short, be short, belong, bucket, bucketshop,
   decorticate, deposit margin, excoriate, flay, go long, hold on,
   make a killing, make a scoop, margin up, miss the market, operate,
   overstay the market, pare, peel, play the market, plunge, pyramid,
   scoop the market, skin, speculate, stag, stag the market, strip,
   take a flier, trade on margin, venture