Aneurysm

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late Middle English: from Greek aneurusma ‘dilatation’, from aneurunein ‘widen out’.

wiktionary

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From Ancient Greek ἀνεύρυσμα(aneúrusma, “a widening, a dilatation”), from ἀνευρύνω(aneurúnō, “to dilate”), from ἀνά(aná, “up”) + εὐρύς(eurús, “wide”).

etymonline

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aneurysm (n.)

"dilation of an artery," early 15c., from Medieval Latin aneurisma, from Greek aneurysmos "dilation," from aneurynein "to dilate," from ana "up" (see ana-) + eurynein "widen," from eurys "broad, wide" (see eury-). Related: Aneurysmal; aneurysmic.