There are 3 definitions of cos in English:

cos1

Line breaks: cos
Pronunciation: /kɒs
 
/
(also cos lettuce)

noun

British
A lettuce of a variety with crisp narrow leaves that form a tall head.
More example sentences
  • To start I had the Greek salad of cos and oak leaf lettuce, red and yellow peppers, paper thin red onion slices, creamy feta cheese and a herb and mustard vinaigrette.
  • These cabbages have more than one shape, for example long and narrow like a cos lettuce, or less long and barrel shaped in profile.
  • Lettuces fall into three basic categories - cos, crisp head and loose leaf types.

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: ˌ(h)yo͞oməˈresk
noun
a short, lively piece of music

There are 3 definitions of cos in English:

cos3

Line breaks: cos
Pronunciation: /kɒz
 
, kəz
 
/
(also 'cos or coz)

conjunction

British informal
short for because.
More example sentences
  • I'm not sure why I've never called her by name coz it's not like she'd mind.
  • It's such a shame coz everything else I'm wearing is actually quite nice.
  • Take a look now, coz I'll probably have given it up by the end of the week.

Definition of cos in: