The Collaborative International Dictionary of English v.0.48:

Silverfish \Sil"ver*fish`\, n.
   1. (Zool.)
      (a) The tarpum.
      (b) A white variety of the goldfish.
          [1913 Webster]

   2. one of a variety of insects of the order Thysanura,
      especially Lepisma saccharina, which may infest houses,
      and eats starched clothing and sized papers. See
      Lepisma.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Lepisma \Le*pis"ma\ (l[-e]*p[i^]z"m[.a]), n. [NL., fr. Gr.
   le`pisma peel, fr. lepi`s -i`dos, a scale.] (Zool.)
   A genus of wingless thysanurous insects having an elongated
   flattened body, covered with shining scales and terminated by
   seven unequal bristles. A common species (Lepisma
   saccharina) is found in houses, and often injures books and
   furniture; it feeds on starch and eats sized paper and
   starched clothes. Called also shiner, silverfish, silver
   witch, silver moth, and furniture bug.
   [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Tarpum \Tar"pum\, n. (Zool.)
   A very large marine fish (Megapolis Atlanticus) of the
   Southern United States and the West Indies. It often becomes
   six or more feet in length, and has large silvery scales. The
   scales are a staple article of trade, and are used in
   fancywork. Called also tarpon, sabalo, savanilla,
   silverfish, and jewfish.
   [1913 Webster]

WordNet (r) 3.0 (2006):

silverfish
    n 1: silver-grey wingless insect found in houses feeding on book
         bindings and starched clothing [syn: silverfish, Lepisma
         saccharina]
    2: a silvery variety of Carassius auratus