Jastrow: שְׁפִיפוֹן

שְׁפִיפוֹן m. (b. h. שְׁפִיפֹן; שפף) [sliding,] a species of serpents, adder (?). Num. R. s. 149 כנגד … נחש וש׳ corresponding to the two things to which his (Dan’s) father compared him, serpent and sh’fifon. Sot. 10ᵃ בלעם … שנאמר ש׳ וכ׳ Balaam was lame in one foot, for we read (Num. XXIII, 3), and he went shefi; Samson was lame in both feet, for it says (Gen. XLIX, 17) sh’fifon (sliding) on the road. Y. Ter. VIII, 45ᵈ bot. מין קטן הוא ושמו ש׳ it is a small kind of serpent, its name is sh’fifon, and it is as thin as a hair.