Source : Webster's Revised Unabridged Dictionary (1913)

Queen olive \Queen olive\ [Cf. Sp. aceituna de la Reina olive of
   the Queen.] (Olive Trade)
   Properly, a kind of superior olive grown in the region of
   Seville, Spain. It is large size and oblong shape with a
   small but long pit; it is cured when green, keeps well, and
   has a delicate flavor. Loosely, any olive of similar
   character.