deep vein thrombosis
US /diːp veɪn θrɑmˈboʊ.sɪs/
UK /diːp veɪn θrɑmˈboʊ.sɪs/

1.
a medical condition in which a blood clot forms in a deep vein, usually in the leg or thigh
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Long flights can increase the risk of developing deep vein thrombosis.
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Symptoms of deep vein thrombosis include swelling, pain, and redness in the affected limb.
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