spear•headPronunciation: (spēr'hed"), [key]
the sharp-pointed head that forms the piercing end of a spear.
any person, contingent, or force that leads an attack, undertaking, etc.
to act as a spearhead for: She spearheaded the drive for new members.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.