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Noun
Definition: A boulder worn by running water that is too large to be rolled as a pebble, worn smooth on the upstream or seaward side and exposed top and with a sharp ridge on the downstream or landward side.
VariousWords beta
Definition: A boulder worn by running water that is too large to be rolled as a pebble, worn smooth on the upstream or seaward side and exposed top and with a sharp ridge on the downstream or landward side.