obstruction of a blood vessel or organ by an embolus.

1945–50; embol(us) + -ization

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World English Dictionary
embolize or embolise (ˈɛmbəˌlaɪz)
(tr) to cause embolism in (a blood vessel)
embolise or embolise
emboli'zation or embolise
emboli'sation or embolise

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American Heritage
Medical Dictionary

embolization em·bo·li·za·tion (ěm'bə-lĭ-zā'shən)

  1. The process by which a blood vessel or organ is obstructed by an embolus or other mass.

  2. The surgical introduction of various substances into the circulatory system to obstruct specific blood vessels.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
In some cases, a procedure called embolization is performed before surgery to shrink the tumor.
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