1. a long tuft of hair left on top of the shaven head;
The Collaborative International Dictionary of English v.0.48:
Scalp \Scalp\, n. [Perhaps akin to D. schelp shell. Cf.
1. That part of the integument of the head which is usually
covered with hair.
By the bare scalp of Robin Hodd's fat friar,
This fellow were a king for our wild faction!
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.
3. Fig.: The top; the summit. --Macaulay.
Scalp lock, a long tuft of hair left on the crown of the
head by the warriors of some tribes of American Indians.
WordNet (r) 3.0 (2006):
n 1: a long tuft of hair left on top of the shaven head