rotula /rotˈū-lə/

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

• tachometer
• tachometers
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• tachometry
• tachos
• tachy-
• tachycardia
• tachycardias
• tachygraph
• tachygrapher
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• tachygraphic
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• tachygraphies
• tachygraphist
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• tachylite
• tachylitic
• tachylyte
• tachylytes
• tachylytic