hand ax

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A short-handled ax; a hatchet.
• noun A cutting or chopping tool, especially of the early Paleolithic Period, typically consisting of a stone that has been flaked on one or both sides to produce a sharp edge.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a stone tool with a cutting edge; the stone is held in the hand and used for chopping