Enter a clue or pattern or both:
The Clue
Oscillation of a lake's surface (6 letter answer)
The Answer
SEICHE
Tags
Notes
The answer SEICHE is so rare that it appears less than once every 2500 puzzles.
Definition
SEICHE as a noun:
1. a wave on the surface of a lake or landlocked bay; caused by atmospheric or seismic disturbances