1. (of a plant ovule) completely inverted; turned back 180 degrees on its stalk
   - inverted

Antonym: amphitropous

• oxycodone
• Oxydendrum
• Oxydendrum arboreum
• oxygen
• oxygen acid
• oxygen debt
• oxygen deficit
• oxygen mask
• oxygen tent
• oxygenase
• oxygenate
• oxygenation
• oxygenic
• oxygenise
• oxygenize
• oxyhaemoglobin
• oxyhemoglobin
• Oxylebius
• Oxylebius pictus
• oxymoron
• oxymuriatic
• oxyntic
• oxyopia
• oxyphenbutazone
• oxyphencyclimine