What is defined as a sudden attack or weakness or paralysis caused by interrupted blood flow to the brain?

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Stroke is a sudden interruption of blood flow to part of the brain, which damages brain cells and produces abrupt neurologic deficits such as weakness or paralysis on one side, along with possible speech or facial changes. Because brain tissue needs a constant blood supply, this interruption causes symptoms to appear suddenly and can lead to lasting disability if not treated quickly.

Heart attack affects blood flow to the heart, not the brain. A seizure is an abnormal electrical disturbance in the brain, not defined by a blood-flow blockage. A transient ischemic attack is a brief, temporary disruption of blood flow that causes stroke-like symptoms but resolves without lasting damage. The description in the question aligns with stroke due to its sudden onset of weakness or paralysis from brain blood-flow interruption.