Learn how to say Lettuce correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word lettuce:
a cultivated plant of the daisy family, with edible leaves that are eaten in salads.
Lactuca sativa, family Compositae
used in names of other plants with edible green leaves, e.g. lamb’s lettuce, sea lettuce.
Middle English: from Old French letues, laitues, plural of laitue, from Latin lactuca, from lac, lact- ‘milk’ (because of its milky juice)
Remember that lettuce has a double t and that it ends with -uce.