- Thrombendarteriectomy combines three prefixes and one suffix. A number of spelling variants which add interfixes at various points are attested; the most extreme is thromboendoarterioectomy. Conversely, a few variants omit the i from the stem of arteri-, perhaps having mistaken it for an unnecessary interfix. Finally, several variants dividing thromb-, end-, or both from the rest of the word with hyphens.
thromb- (“thrombus”) + end- (“inside”) + arteri- (“artery”) + -ectomy (“excision”)