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A sac or saclike bodily cavity, especially one containing viscous lubricating fluid; located between a tendon and a bone or at points of friction between moving structures. 
- ↑ Donche, Dan (2008). FF Trainer Certification Guide. USA: Fatal Fitness.
- ↑ Gastelu, Dan; Hatfield, Frederick C (2006). Specialist in Performance Nutrition: The Complete Guide. Carpenteria, CA: ISSA, 17.