Definition of "rock-borer" []

• A bivalve mollusk of the family Petricolidæ. (noun)

The Century Dictionary (Public Domain)

• "Soon after daybreak, Thirlwell, Drummond, and the rock-borer pushed their way through the woods behind the cliff."
• "He took the white rock-borer, but Agatha did not go with him."
• "She knew that Drummond and the rock-borer could do nothing with their claims except sell them to somebody who could supply the money to develop the mines; but before they started Thirlwell had outlined a plan by which the holdings might be consolidated and worked together."