also: せっこう
noun
stonemason; mason; stonecutter
A person who works with stone, cutting, shaping, and building with it.
彼の祖父は腕のいい石工だった。
His grandfather was a skilled stonemason.
石工が城壁の石を一つ一つ積み上げた。
The stonemason laid the castle wall stones one by one.
Compound of 石 (stone) and 工 (craftsman). The reading いしく is the native Japanese reading, while せっこう is the Sino-Japanese reading.