It means mugrite, dirty, stain. Also generate silt, mud, mud or sediments that fill the bottom of a stream of water. It is used in some parts of Spain.
ENRUNAR: Aragon, build or solar with rubble or debris.
Cover with Earth. A seed is enruna to make it grip. Plants potatoes ( you planting potatoes ) and the enrunas with Earth... I'm from the sierra de Albarracín and there not built with rubble...