1.NounA sensation of dryness in the throat associated with a craving for liquids, produced by deprivation of drink, or by some other cause (such as fear, excitement, etc.) which stops the secretion of the pharyngeal mucous membrane.
"We developed a great thirst during our hike.; He had quite a thirst on and so headed to his favourite Dublin pub."
2.NounThe condition producing the sensation of thirst.
"If you go out in the desert for long without water, the thirst can drive you mad."
3.NounA want and eager desire (for something); a craving or longing.
"She had a real thirst for news and that greatly helped her career."
4.NounSexual lust.
"He had a thirst for her and she had the same for him."
5.VerbTo be thirsty.
6.VerbTo desire vehemently.
"I thirst for knowledge and education will sate me."