From earlier lushious, lussyouse, a corruption of lustious, from lusty + -ous. Shakespeare uses both lush (short for lushious) and lusty in the same sense: "How lush and lusty the grass looks" (The Tempest ii. I.52).
An alternative etymology connects luscious to a Middle English term: lucius, an alteration of licious, believed to be a shortening of delicious.
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