rotula /rotˈū-lə/

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

• free-range
• free reed
• free-reed
• free ride
• freeride
• free-rider
• free-riders
• free rides
• freeride skiing
• freers
• free running
• frees
• free school
• free schools
• free-select
• free-selected
• free-selecting
• free-selection
• free-selector
• free-selectors
• free-selects
• freesheet
• freesheets
• free-shot
• free-shots