Dic: yet (as a conjunction)

• I don't eat much, yet I am a size 16.
• It is completely waterproof, yet light and comfortable.
• Kelly was a convicted criminal, yet many people admired him.
• She does not speak our language and yet she seems to understand what we say.
• a story that is strange yet true
• an inexpensive yet effective solution to our problem

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△You can use yet to introduce a fact which is rather surprising after the previous fact you have just mentioned. (=but)
△ Yet(2): used to introduce a fact, situation, or quality that is surprising after what you have just said.

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CF. Similar usage as an adverb:

• I saw yet another doctor. 
• They would criticize me, or worse yet, pay no attention.
• It is plain to see we will not have anything to eat yet again.
• He got a call from the factory, telling of yet more problems.
• Inflation had risen to a yet higher level.
• Yet another reason to be cautious
• The meeting has been cancelled yet again (=one more time after many others).

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△ You can use yet to emphasize a word, esp. when you are say that something is surprising because it is more extreme than previous things of its kind, or a further case of them.

△ used to emphasize that something is even more than it was before or is in addition to what existed before. (=still)

.... COBUILD, LDOCE