[ 't&sk ] (noun.) before 12th century. From Old English tux, tusc, cognate with Old Frisian tusk, probably from the Proto-Germanic *tunthskaz, an extended form of the linguistic root of tooth. Cognates with the Old Norse toskr (“a tusk, a tooth”) and Icelandic toskur, whence the Old Norse and Icelandic Ratatoskr and Ratatoskur respectively.