: a swelling behind the knee that is composed of a membrane-lined sac filled with synovial fluid and is associated with certain joint disorders (as arthritis)
Cite this Entry
“Baker's cyst.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Baker%27s%20cyst. Accessed 7 Jul. 2026.
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