why waste 20 seconds posting a rhetorical question when you could've just kept your mouth shut?

Oh, and baby. What you're looking at is the verb cat, not the plural form of the noun cat. And maybe I'm just blind, but this is the only thing I see on dictionary.com's page.

let·tuce Audio pronunciation of "lettuce" ( P ) Pronunciation Key (lts)
n.

1.
1. Any of various plants of the genus Lactuca, especially L. sativa, cultivated for their edible leaves.
2. The leaves of L. sativa, used especially in salads.
2. Slang. Paper money.


[Middle English lettuse, from Old French laitues, pl. of laitue, from Latin lactca, from lac, lact-, milk (from its milky juice). See melg- in Indo-European Roots.]