The Collaborative International Dictionary of English v.0.48:

Moly \Mo"ly\, n. [L., fr. Gr. ?.]
   1. A fabulous herb of occult power, having a black root and
      white blossoms, said by Homer to have been given by Hermes
      to Ulysses to counteract the spells of Circe. --Milton.
      [1913 Webster]

   2. (Bot.) A kind of garlic (Allium Moly) with large yellow
      flowers; -- called also golden garlic.
      [1913 Webster]