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1. Having the form or shape of an eel: "An eel is a common name for any fish of the ten families that are part of the order Anguilliformes, and they characterized by having long snakelike bodies covered with tiny scales embedded in their skins. Eels do not have a hind pair of fins and so they are adapted for wriggling in the mud and through the crevices of reefs and rocky shores."
"The common freshwater eel, Anguilla rostrata, of the family Anguillidae, is found in the Atlantic coastal regions of Europe, in the Mediterranean area, and in North America East of the Rocky Mountains (mountain range that extends from British Columbia to northern New Mexico)."
3. Etymology: from Latin anguilla "eel", a diminutive (indicating smallness) of anguis, "snake".