Eft is the term for an immature newt. Newts are brightly-colored salamanders. They are known for their ability to regenerate limbs, eyes, and spinal cords. Many produce toxins through skin secretions. Newts were originally known as efts, but at some point in the history of the word, it came to be spelled euft, and then later ewt, but eventually became newt from there. Now, eft only refers to just-metamorphosed juveniles.