Definition of eau:
(n) :
Water.
(n) :
(Lincolnshire) Any of several rivers in Lincolnshire.
(n) :
(Lincolnshire) Alternative form of ea. [(UK dialect or archaic) A river or watercourse.]
(n) :
(politics, economics) Initialism of Eurasian Economic Union. [an economic union between the Russian Federation, Belarus, Kazakhstan, Armenia and Kyrgyzstan]