1. A steel rock drill with a star-shaped point that is used for making holes in stones or masonry; it is operated by hitting the end with a hammer while rotating it between blows

Derived forms: star drills

Type of: bore bit, borer, rock drill, stone drill

• plotter
• plough
• plough horse
• umbel
• umbel-like
• Umbellales
• umbellar
• umbellate
• umbellifer
• Umbelliferae
• umbelliferous
• umbelliferous plant
• umbelliform
• Umbellularia
• Umbellularia californica
• umber
• umbilical
• umbilical cord
• umbilical hernia
• umbilical vein
• umbilical vesicle
• umbilicate
• umbilicus
• umbles
• umbo