GUILLOCHE is a 9 letter word that starts with G.

1. \Guil"loche`\, n. [F. guillochis; -- said to be fr.
   Guillot, the inventor of a machine for carving it.] (Arch.)
   An ornament in the form of two or more bands or strings
   twisted over each other in a continued series, leaving
   circular openings which are filled with round ornaments.
   
   

2. \Guil`loche"\, n.
   In ornamental art, any pattern made by interlacing curved
   lines.