刃脊是一种陡峭的刀状山脊，也叫刃岭、刀岭。通常是由两条冰川侵蚀山脊两侧而形成。也有一些是由两个相邻的冰斗后退而形成刃脊。

An arête is a thin, almost knife-like, ridge of rock which is typically formed when two glaciers erode parallel U-shaped valleys. The arête is a thin ridge of rock that is left separating the two valleys. Arêtes can also form when two glacial cirques erode headwards towards one another, although frequently this results in a saddle-shaped pass, called a col. The edge is then sharpened by freeze-thaw weathering, and the slope on either side of the arete steepened through mass wasting events and the erosion of exposed, unstable rock. The word "arête" is actually French for edge or ridge; similar features in the Alps are described with the German equivalent term Grat.