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

• laboratory bench
• laboratory coat
• labored
• laborer
• laboring
• laborious
• laboriously
• laboriousness
• laborsaving
• labour
• labour agreement
• labour camp
• labour coach
• labour contract
• Labour Day
• labour force
• labour leader
• labour market
• labour movement
• labour of love
• labour organiser
• labour organizer
• labour pain
• labour pains
• labour party