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Webster 1913 Edition

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Noun.

[Pg., a chip of stone, gravel.]

A deposit of pebbles, gravel, and ferruginous sand, in which the Brazilian diamond is usually found.

Noun.

In Brazil, a deposit of pebbles, gravel and sand in which the diamond is usually found.

cascalho ‎(uncountable)

(South America) A deposit of pebbles, gravel, and ferruginous sand in which diamonds may be found.

casca +‎ -alho

cascalho m (plural cascalhos)