Webster's English Dictionary

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lettuce

let.tuce \'let-*s\ n [ME letuse, fr. OF laitues, pl. of laitue, fr. L 
   lactucaX, fr. lact-, lac milk; fr. its milky juice - more at GALAXY : any 
   of a genus (Lactuca) of composite plants; esp : a comm on garden vegetable 
   (L. sativa) the succulent leaves of which are used esp. in salads