stylolite noun. ['stʌɪlǝlʌɪt] M19.
[from Greek stulos column + -LITE.]
Geology. A surface or seam within a limestone or (occas.) sandstone, characterized by irregular interlocking pegs and sockets around 1 cm in depth and a concentration of insoluble substances. Also, a grooved peg forming part of such a seam.

■ stylo'litic adjective M19.

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