1. Orchid of South America and Trinidad having large yellow and reddish-brown flowers; sometimes placed in genus Oncidium
   - Oncidium papilio

Type of: butterfly orchid

• underwater archaeology
• underwater archeology
• underwater diver
• underway
• underwear
• underweight
• underwhelm
• underwing
• underwood
• underworld
• underwrite
• underwriter
• undescended
• undescended testicle
• undescended testis
• undescriptive
• undeserved
• undeservedly
• undeserving
• undesigned
• undesirability
• undesirable
• undesirably
• undesired
• undesiring