Webster's English Dictionary

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thrombosis

throm.bo.sis \thra:m-'bo--s*s, thr*m-\ \-'ba:t-ik\ n [NL, fr. Gk 
   thrombo-sis clotting, deriv. of thrombos clot] : the formation or presence 
   of a blood clot within a blood vessel during l ife - throm.bot.ic aj