1. Made up of or containing rock fragments or ash from a volcanic eruption

Encyclopedia: Pyroclastic

• Hopkins
• Hopkinson
• hoplite
• hopped-up
• hopper
• hopping mad
• hopple
• hops
• hopsack
• hopsacking
• hopscotch
• hora
• Horace
• Horace Greeley
• Horace Mann
• Horace Walpole
• horal
• horary
• Horatian ode
• Horatio Alger
• Horatio Herbert Kitchener
• Horatio Hornblower
• Horatio Nelson
• Horatio Walpole
• horde