1. A large drum with two heads; makes a sound of indefinite but very low pitch
   - bass drum

Type of: drum, membranophone, tympan

• Orectolobidae
• Orectolobus
• Orectolobus barbatus
• oregano
• Oregon
• Oregon alder
• Oregon ash
• Oregon cedar
• Oregon crab apple
• Oregon fir
• Oregon grape
• Oregon holly grape
• Oregon Jargon
• Oregon larch
• Oregon lily
• Oregon maple
• Oregon myrtle
• Oregon oak
• Oregon pine
• Oregon white oak
• Oregonian
• oreide
• oreo
• oreo cookie
• Oreopteris