A composite plant of the genus Lactuca (L. sativa), the leaves of which are used as salad. Plants of this genus yield a milky juice, from which lactucarium is obtained. The commonest wild lettuce of the United States is L. Canadensis.
- Any of various plants of the genus Lactuca, especially L. sativa, cultivated for their edible leaves.
- The leaves of L. sativa, used especially in salads.
- Slang Paper money.