The Collaborative International Dictionary of English v.0.48:
Domesday \Domes"day`\, n.
A day of judgment. See Doomsday. [Obs.]
Domesday Book, the ancient record of the survey of most of
the lands of England, made by order of William the
Conqueror, about 1086. It consists of two volumes, a large
folio and a quarto, and gives the proprietors' tenures,
arable land, woodland, etc. [Written also Doomsday
Bouvier's Law Dictionary, Revised 6th Ed (1856):
DOMESDAY, or DOMESDAY-BOOK. An ancient record made in the time of William
the Conqueror, and now remaining in the English exchequer, consisting of two
volumes of unequal sizes, containing surveys of the lands in England.