资料来源 : Webster's Revised Unabridged Dictionary (1913)

Lactuca \Lac*tu"ca\, n. [L., lettuce. See {Lettuce}.] (Bot.)
   A genus of composite herbs, several of which are cultivated
   foe salad; lettuce.

资料来源 : WordNet®

Lactuca
     n : an herb with milky juice: lettuce; prickly lettuce [syn: {genus
         Lactuca}]