Lewis Short
mūrēnŭla | mūraen- (noun F) : (), , dim. 1. murena.
* A small murena (late Lat.): murenulam strictis manibus tenere, Hier. praef. in Job.
* Transf., a small necklace resembling a murena: aurum colli sui, quod quidem murenulam vulgus vocat,Hier. Ep. 24, 3; id. in Isa. 2, 3, 18.
Charlton T. Lewis, Charles Short, A Latin Dictionary