petraeus, a, um, adj., = πετραῖος,
that grows among rocks , rock- (post-Aug.) brassica, Plin. 20, 9, 36, § 92.
Pĕtraeus, a, um, v. 2. Petra, I. B. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.