gulgul

Century Dictionary and Cyclopedia

1. n. A sort of chunam or cement made of pounded sea-shells mixed with oil, which hardens like stone, and is used in India to cover ships' bottoms. It is impenetrable by worms even when unprotected by copper.

Wiktionary

1. n. A cement made in India from seashells pulverized and mixed with oil, and spread over a ship's bottom to prevent worms from boring into it.

GNU Webster's 1913

1. n. A cement made in India from sea shells, pulverized and mixed with oil, and spread over a ship's bottom, to prevent the boring of worms.