rotula /rotˈū-lə/

1. The knee-cap (anatomy)
2. A radial piece of Aristotle's lantern in sea-urchins (zoology)

• Oxford groups
• Oxfordian
• Oxford movement
• Oxfords
• Oxford shoe
• oxgang
• oxgangs
• oxgate
• oxgates
• oxhead
• oxheads
• oxi-
• oxidant
• oxidants
• oxidase
• oxidases
• oxidate
• oxidated
• oxidates
• oxidating
• oxidation
• oxidational
• oxidation-reduction
• oxidations
• oxidative