Mudhole

noun

1. A soft spot in granite due to decomposition.
2. A place full of mud; a spot where there is mud of considerable depth; a depression where water and mud stand, as in a road.
3. In steam-engines, an orifice with steamtight covering in the bottom of a boiler, through which the sediment is removed. Also <internalXref urlencoded="mudvalve">mudvalve</internalXref>.
4. A salt-water lagoon in which whales are captured.
5. A hole, or hollow place, containing mud, as in a road.