Definition of stylolite

A surface or contact, usually in carbonate rocks, that is marked by an irregular and interlocking penetration of the two sides: the columns, pits, and teeth-like projections on one side fit into their counterparts on the other. As usually seen in cross section, it resembles a suture or the tracing of a stylus. The seam is characterized by a concentration of insoluble constituents of the rock; e.g., clay, carbon or iron oxides, and is commonly parallel to the bedding. Etymol: Greek stylos, pillar, + lithos, stone.
Stylolites are caused by pressure dissolution.

Synonym of: crowfoot, suture joint

Refs:
AGI
https://en.wikipedia.org/wiki/Stylolite