There are 3 definitions of cos in English:

cos1

Syllabification: cos
Pronunciation: /käs, kôs
 
/
(also cos lettuce)

noun

another term for romaine.
More example sentences
  • Dill pickles, a bit of cos lettuce, slithers of Parmesan - that's all you need.
  • Tear basil, mint, coriander, parsley and cos and place in a large salad or mixing bowl.
  • The cold entrées were Smoked Chicken Caesar Salad, with cos lettuce and croutons dressed with shaved Parmesan cheese, and Avocado, Pancetta and Stilton Salad on a bed of mixed leaves with baby spinach.

Origin

late 17th century: named after the Aegean island of Cos, where it originated.

Definition of cos in:

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Word of the day humoresque
Pronunciation: ˌhjuːməˈrɛsk
noun
a short, lively piece of music

There are 3 definitions of cos in English:

cos2

Syllabification: cos
Pronunciation: /
 
käs/

abbreviation

Cosine.

Definition of cos in:

There are 3 definitions of cos in English:

cos3

Line breaks: cos
Pronunciation: /kɒz, kəz/

Entry from British & World English dictionary

(also 'cos or coz)

conjunction

British informal
short for because.

Definition of cos in: