Medical term for a mass (such as a blood clot or air bubble) that travels through the bloodstream and blocks a vessel. Often used in compound terms like 肺栓塞 (pulmonary embolism).
See also: 塞栓
肺栓塞は命に関わることがある。
A pulmonary embolism can be life-threatening.
A Sino-Japanese medical term composed of 栓 (plug, stopper) and 塞 (block, obstruct). The exact historical derivation is uncertain, but the kanji combination directly reflects the concept of a blocking plug in a vessel.