1. A fire (usually on a hill or tower) that can be seen from a distance
   - beacon

Type of: visual signal

• underwhelm
• underwing
• underwood
• underworld
• underwrite
• underwriter
• undescended
• undescended testicle
• undescended testis
• undescriptive
• undeserved
• undeservedly
• undeserving
• undesigned
• undesirability
• undesirable
• undesirably
• undesired
• undesiring
• undesirous
• undestroyable
• undetectable
• undetected
• undeterminable
• undetermined