Enter a clue or pattern or both:
The Clue
Has reciprocal effect (9 letter answer)
The Answer
INTERACTS
Tags
Notes
The answer INTERACTS is so rare that it appears less than once every 2500 puzzles.
Related Clues
Influences, in a way
Plays with others, for instance
Definition
INTERACT as a verb:
1. act together or towards others or with others; "He should interact more with his colleagues"