counterflow

From counter- + flow.

counterflow (countable and uncountable, plural counterflows)

1. A flow in the opposite direction; or the flow of two fluids in opposite directions
   • 2009 January 5, “Using the Earth and Sun to Provide Home Heating”, in New York Times‎^[1]:

     We, too, used […] a counterflow heat exchanger to warm incoming fresh air.

2. (Philippines) Driving in the opposite direction.

counterflow (third-person singular simple present counterflows, present participle counterflowing, simple past and past participle counterflowed)

1. To flow in the opposite direction