(geology) a bulbous protrusion at the front of a lava flow or landslide.

Mr Western entered; but not before a small wrangling bout had passed between him and his chairmen; for the fellows, who had taken up their burden at the Hercules Pillars, had conceived no hopes of having any future good customer in the squire […]

If the bishop, parson, or vicar, etc., dilapidates the buildings, or cuts down the timber of the patrimony […]

I cut back again myself and went over the top of the wave.