rotula /rotˈū-lə/

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

• mainstreams
• Main Street
• mainstreeting
• mainstreetings
• maintain
• maintainabilities
• maintainability
• maintainable
• maintain capital intact
• maintained
• maintainer
• maintainers
• maintaining
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• maintenance-man
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• maintenancing
• maintop
• maintop-gallant-mast
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• maintopmasts