a circular movement of water causing a small whirlpool. 3 days ago · Meaning of eddy in English. (Entry 1 of 3) 1a : a current of water or air running contrary to the main current especially : a circular current : whirlpool. Eddy definition, a current at variance with the main current in a stream of liquid or gas, especially one having a rotary or whirling motion. Eddy definition: An eddy is a movement in water or in the air which goes round and round instead of. 1A circular movement of water causing a small whirlpool.