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The Collaborative International Dictionary
Cackerel

Cackerel \Cack"er*el\, n. [OF. caquerel cagarel (Cotgr.), from the root of E. cack.] (Zo["o]l.) The mendole; a small worthless Mediterranean fish considered poisonous by the ancients. See Mendole.

Wiktionary
cackerel

n. The mendole; a small Mediterranean fish considered poisonous by the ancients.