From The Collaborative International Dictionary of English v.0.48:
Drought \Drought\ (drout), n. [OE. droght, drougth, dru[yogh][eth], AS. druga[eth], from drugian to dry. See Dry, and cf. Drouth, which shows the original final sound.] 1. Dryness; want of rain or of water; especially, such dryness of the weather as affects the earth, and prevents the growth of plants; aridity. [1913 Webster]
The drought of March hath pierced to the root. --Chaucer. [1913 Webster]
In a drought the thirsty creatures cry. --Dryden. [1913 Webster]
2. Thirst; want of drink. --Johnson. [1913 Webster]
3. Scarcity; lack. [1913 Webster]
A drought of Christian writers caused a dearth of all history. --Fuller. [1913 Webster]