noun Physiology.
the passage of blood cells, especially leukocytes, through the unruptured walls of the capillaries into the tissues.

1615–25; < Neo-Latin < Greek diapḗdēsis a leaping through, equivalent to diapēdē- (verbid stem of diapēdân to leap through) + -sis -sis

diapedetic [dahy-uh-pi-det-ik] , adjective
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World English Dictionary
diapedesis (ˌdaɪəpəˈdiːsɪs)
the passage of blood cells through the unruptured wall of a blood vessel into the surrounding tissues
[C17: New Latin, from Greek: a leaping through, from diapēdan to spring through, from dia- + pēdan to leap]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

diapedesis di·a·pe·de·sis (dī'ə-pĭ-dē'sĭs)
The movement or passage of blood cells, especially white blood cells, through intact capillary walls into surrounding body tissue. Also called migration.

The American Heritage® Stedman's Medical Dictionary
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