Lewis & Short

galbĭnus, a, um, adj. [either from galbanum or from GALBUS],

  1. I. greenish-yellow, yellowish; cf. tunica, Vop. Aur. 34: avis, Mart. 13, 68, 1: cingillum, Petr. 67, 4.
    As subst. plur.: galbĭna (sc. vestimenta), ōrum, n., pale-green garments, Juv. 2, 97.
    Hence,
  2. II. Transf., effeminate: moris, Mart. 1, 97, 9.