Real Dictionary

eddy
countable noun: An eddy is a movement in water or in the air which goes round and round instead of flowing in one continuous direction.
verb: To eddy means to move round and round, or to move in a disorganized way.

Eddy in American English
a current of air, water, etc. moving against the main current and with a circular motion; little whirlpool or whirlwind
Mary Baker(born Mary Morse Baker) 1821-1910; U.S. founder of Christian Science
to move or whirl in eddies
to move with a circular motion against the main current; move in an eddy
noun: a current at variance with the main current in a stream of liquid or gas, esp. one having a rotary or whirling motion
noun: a male given name, form of Edgar or Edward

eddy in British English
noun: a movement in a stream of air, water, or other fluid in which the current doubles back on itself causing a miniature whirlwind or whirlpool
noun: Mary Baker. 1821–1910, US religious leader; founder of the Christian Science movement (1866)
verb: to move or cause to move against the main current

eddy in Chemical Engineering
noun: An eddy is an area of fluid where the flow is circular.