- pl. silverfish, silverfishes any of various fishes of a silvery color, as the tarpon or silverside
- pl. silverfish any of various families of primitive, wingless thysanuran insects with silvery scales, long feelers, and a bristly tail: they thrive in dampness and darkness and are often injurious to books and other paper products
See silverfish in American Heritage Dictionary 4
noun pl. silverfish silverfish
- Any of various fishes having silvery scales, such as a tarpon or silverside.
- A small silvery or gray bristletail (Lepisma saccharina) that feeds on the starchy material in bookbindings, wallpaper, clothing, and food, often causing extensive damage.