The story
Blend of Charybdis + toxin; along with scyllatoxin in the same scorpion's venom, it references the monsters Scylla and Charybdis of Ancient Greek mythology.
Etymology from Wiktionary, CC BY-SA 4.0.
charybdotoxin
Today it means: An oligopeptide neurotoxin from the venom of a scorpion of the genus Leiurus. Full definition →