Lewis Short
grīphus (noun M) = γρῖφος: (a net; hence transf.)
* An intricate or puzzling question, a riddle, enigma (post-class. and very rare): griphos dissolvere,Gell. 1, 4, 4; v. App. Flor. 9; Aus. Idyll. 11.
Charlton T. Lewis, Charles Short, A Latin Dictionary