in masonry, the carving or finishing of building stones with irregular grooves intended to resemble worm tracks. Vermiculation is one form of surface rustication, the intention of which is to create a decorative contrast between the rusticated work, ordinarily confined to the lowest story of a building, and the finely dressed ashlar above.

Vermiculated rustics may be found in several areas of the Louvre, Paris. It has frequently been simulated in floor tile, stucco, and other compositions.