I. ˈkau̇n-tər-ˌkər-ənt, -ˌkə-rənt noun
Date: 1684
: a current flowing in a direction opposite that of another current
II. ˌkau̇n-tər-ˈ adjective
Date: 1799
1. : flowing in an opposite direction
2. : involving flow of materials in opposite directions
countercurrent dialysis
• coun·ter·cur·rent·ly adverb