_Origin of Adur_ (Vol. ii., p. 71.).--A, derived from the same root as
Aqua and the French _Eau_, is a frequent component of the names of
rivers: "A-dur, A-run, A-von, A-mon," the adjunct being supposed to
express the individual characteristic of the stream. _A-dur_ would then
mean the _river of oaks_, which its course from Horsham Forest through
the Weald of Sussex, of which "oak is the weed," would sufficiently
justify. It is called in ancient geography _Adurnus_, and is probably
from the same root as the French _Adour_.