: a complete ring of arteries at the base of the brain that is formed by the cerebral and communicating arteries and is a site of aneurysms
Dictionary Entries Near circle of Willis
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“Circle of Willis.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/circle%20of%20Willis. Accessed 15 Dec. 2024.
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