SCARABAEUS is a 10 letter word that starts with S.

1. \Scar*a*b[ae]"us\, n. (Egypt. Arch[ae]ol.)
   A conventionalized representation of a beetle, with its legs
   held closely at its sides, carved in natural or made in baked
   clay, and commonly having an inscription on the flat
   underside.
   
   

2. \Scar`a*b[ae]"us\, n. [L.] (Zo["o]l.)
   Same as {Scarab}.