1. Being or operating under the surface of the earth
   - subterranean 
2. Lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed)
   - subterranean, ulterior

See also: covert, subsurface

• prandial
• prang
• prang up
• prank
• prankish
• prankishness
• prankster
• prase
• praseodymium
• prat
• prate
• prater
• pratfall
• pratincole
• pratique
• prattle
• prattler
• prau
• Praunus
• Pravachol
• pravastatin
• prawn
• prawn cocktail
• praxis
• Praxiteles