2 definitions
for Lactuca
From The Collaborative International Dictionary of English v.0.48 :
Lactuca \Lac*tu"ca\, n. [L., lettuce. See Lettuce.] (Bot.)
A genus of composite herbs, several of which are cultivated
for salad; lettuce.
[1913 Webster]
From WordNet (r) 2.0 :
Lactuca
n : an herb with milky juice: lettuce; prickly lettuce [syn: genus
Lactuca]