Lewis & Short

mūrĭcātus, a, um, adj. [murex], shaped like a purple-fish, pointed.

  1. I. Lit.: folia spinosa, muricatis cacuminibus, Plin. 20, 23, 99, § 262.
  2. II. Transf. (acc. to murex, II. B. 3.), fearful, timid, as if walking over caltrops: gressus, Fulg. Myth. 1.