A variant form of acherontic, meaning relating to the underworld or characterized by gloom and death imagery.
Extended form of acherontic with the additional suffix -al, creating an emphatic or archaic variant. This doubling of suffixes was common in older English to intensify adjective meanings.
Medieval and Renaissance writers loved adding extra suffixes to Greek and Latin words to sound more learned and dramatic—'acherontical' would have impressed educated readers as suitably classical and dark.
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