Relating to or affected by an aneurism (an older spelling variant of aneurysm), the bulging of a weakened artery wall.
From aneurism (the noun) plus the adjective suffix -al, creating the adjectival form to describe things related to or characteristic of aneurisms.
The term 'aneurismal' is largely outdated now that 'aneurysmal' is the standard spelling, but you'll still find it in older medical journals and historical texts from the 1800s and early 1900s.
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