Tishnagi is an Urdu word which means Thirst, 'pyaas' in Hindi. Interestingly though, the origin of the word probably lies in Sanskrit where Trishna is the word for thirst and the same word is followed in Hindi too. At the same time, the Hindi word 'pyaas' is used in Urdu almost equally in general language.
Tishnagi was an album by Shaan. The word is also used in poems and songs quite often.