seiche
Concise Oxford English Dictionary © 2008 Oxford University Press:
seiche /seɪʃ/
▶noun a temporary disturbance or oscillation in the water level of a lake or partially enclosed body of water, especially one caused by changes in atmospheric pressure.
– origin C19: from Swiss Fr., perh. from Ger. Seiche ‘sinking (of water)’.
'seiche' also found in these Oxford entries:

