edge or corner of a rock
Refers to the projecting edge or corner of a rock or stone, often in natural settings.
I bumped my foot on the edge of a rock.
海岸の岩角には貝がたくさん付いている。
Many shells are attached to the edges of the rocks on the shore.
Compound of 岩 (iwa, 'rock') and 角 (kado, 'corner, edge'). The reading いわかど is a straightforward combination.