thirst |
thirstness |
Thirstness is often a misspelling of thirst.
Thirstness has no English definition.
As a noun thirst
is a sensation of dryness in the throat associated with a craving for liquids, produced by deprivation of drink, or by some other cause (as fear, excitement, etc.) which arrests the secretion of the pharyngeal mucous membrane; hence, the condition producing this sensation.
As a verb thirst
is to be thirsty.