Partially ground stone axe

Japanese: 局部磨製石斧 - きょくぶませいせきふ

…There are many types of stone axes, distinguished by their construction, function, and shape. In terms of construction, there are chipped stone axes, which are finished by simply chipping, ground stone axes, which are finished by polishing, and ground stone axes (also called partially ground stone axes), which have an axe head made from natural gravel or an axe head that has been chipped and prepared with a ground blade. Because the main use of stone axes is woodworking, a distinction is sometimes made between felling axes (for felling trees and rough cutting) and processed axes (for gouging and cutting). …

From [Stone Tools]

...The techniques for making these microblades include the Wakubetsu technique in Hokkaido and the Saikai technique in Kyushu. Towards the end of the Paleolithic period, large stone axes weighing nearly 1 kg, known as partially ground stone axes, appeared. The entire body was forged so that the cross section of the body was triangular or semicircular, and only the edge of the blade was ground. ...

*Some of the terminology explanations that refer to "partially ground stone axes" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…石斧には，作り，機能，形状などで多くの種類が区別できる。作りから見ると，打ち欠いただけで仕上げた打製石斧，磨いて仕上げた磨製石斧，自然の礫（れき）を利用した斧身か打ち欠いて整えた斧身に，磨製の刃を加えた刃部磨製石斧(局部磨製石斧ともいう)がある。石斧の主用途が木工用であることから，伐採斧(伐採･粗削り用)と加工斧(えぐり･削り用)が区別されることもある。…