moly1Pronunciation: /ˈməʊli/Definition of moly noun 1a southern European plant related to the onions, with small yellow flowers. Allium moly, family Liliaceae (or Alliaceae) 2a mythical herb with white flowers and black roots, endowed with magic properties. Origin: mid 16th century (in moly1 (sense 2)): via Latin from Greek mōlumoly in other Oxford dictionaries Definition of moly in the US English dictionary