The Collaborative International Dictionary of English v.0.48:

Scarab \Scar"ab\, Scarabee \Scar"a*bee\, n. [L. scarabaeus; cf.
   F. scarab['e]e.]
   1. (Zool.) Any one of numerous species of lamellicorn beetles
      of the genus Scarabaeus, or family Scarabaeidae,
      especially the sacred, or Egyptian, species (Scarabaeus
      sacer, and Scarabaeus Egyptiorum).
      [1913 Webster]

   2. (Egyptian Archaeology, Jewelry) A stylized representation
      of a scarab beetle carved in stone or faience, or made in
      baked clay, usually in a conventionalized form in which
      the beetle has its legs held closely at its sides, and
      commonly having an inscription on the flat underside; -- a
      symbol of resurrection, used by the ancient Egyptians as
      an ornament or a talisman, and in modern times used in
      jewelry, usually by engraving the formalized scarab design
      on cabuchon stones. Also used attributively; as, a scarab
      bracelet [a bracelet containing scarabs]; a ring with a
      scarab [the carved stone itelf].
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

Scarabaeus sacer
    n 1: scarabaeid beetle considered divine by ancient Egyptians
         [syn: scarab, scarabaeus, Scarabaeus sacer]