drought: [OE] Etymologically, drought means simply ‘dryness’. The prehistoric Germanic base that produced English dry (and indeed drain) was *draug-, *drūg-. To this was added the suffix -th, used for creating abstract nouns from adjectives, as in length, strength, and truth; this gave Old English drūgath. The subsequent change of -th to -t (which began in the 13th century) is mirrored in such words as height and theft. => drain, dry
