1. A fine-grained metamorphic rock formed by the action of heat on clay rocks
   - hornfels

Derived forms: hornstones

Type of: metamorphic rock

Encyclopedia: Hornstone

• metol
• metonym
• metonymic
• metonymical
• metonymically
• metonymy
• metope
• metopic
• metopion
• metoprolol
• metralgia
• Metrazol
• metrazol shock
• metrazol shock therapy
• metrazol shock treatment
• metre
• metrestick
• metric
• metric capacity unit
• metric function
• metric grain
• metric hundredweight
• metric linear unit
• metric space
• metric system