What is "thirsts"

Usage examples of "thirsts".

The burning heat of the sun was gone, but the air was still very hot and stifling and oppressive, and the pitiful ration of water each had received just as the sun had gone down had only whetted their appetite for more, made their raging thirsts all the more painful and intolerable.

They were happy because they had slaked their terrible thirsts and drunk their fill, and more than their fill, because the cold rain cooled down their burns and blistered skins, because they had managed to funnel over four gallons of fresh rain-water into one of the tanks.