Anguilliform is a word that describes something as resembling or shaped like an eel. There are several synonyms that can be used to describe such an object or animal. One such word is serpentine, which means twisted or winding like a serpent. Another synonym is undulatory, meaning having a wavelike, rising and falling motion. Sinuous is yet another option, which specifically refers to something having many curves or bends. Snakelike is also a good synonym for anguilliform, as it evokes the image of a twisting, slithering creature. Whichever word is chosen, it will effectively convey the idea of something eel-like in shape or movement.