Mō'ly, n.

noun

n. [Lat. moly, Gr. μῶλυ.]

  1. (Bot.) A plant having a bulbous root; Allium moly, wild garlic.
  2. A fabulous herb of secret power, having a black root and white blossom, said by Homer to have been given by Mercury to Ulysses, as a counter-charm against the spells of Circe.

That moly That Hermes once to wise Ulysses gave. Milton.