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Meaning of “spontaneous occlusion of the circle of Willis” in the English Dictionary

"spontaneous occlusion of the circle of Willis" in British English

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spontaneous occlusion of the circle of Willisnoun [U or C]

uk   /spɒnˌteɪ.ni.əs əˌkluː.ʒən əv ðə ˌsɜː.kəl əv ˈwɪl.ɪs/  us   /spɑːnˌteɪ.ni.əs əˌkluː.ʒən əv ðə ˌsɝː.kəl əv ˈwɪl.ɪs/ specialized
a very rare condition caused by blocked arteries in the circle of Willis (= a ring of arteries at the base of the brain)
(Definition of spontaneous occlusion of the circle of Willis from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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