Daily AncestorThrombosis
Thrombosis meant a blood clot forming inside a vessel and blocking it, unlike embolism, where a clot travels from somewhere else.
Webster's 1913 defines thrombosis as the blocking of a blood vessel by a clot formed at the site, and sets it apart from embolism, caused by a clot or foreign body carried from a distance.
IPUMS gives embolism and thrombosis one code. The 1911 Census Bureau manual asked doctors to state the organ, and whether the clot followed childbirth.
As seen in a recordCause of death line, state death certificate, 1910s to 1930s
Cause: Thrombosis of femoral vein, 10 ds.
Sources
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Daily Ancestor. "Thrombosis." Dictionary of Old Record Words. https://dailyancestor.com/dictionary/causes-of-death/thrombosis. Last checked 2026-10-12.