seiche

The Vilaine receives the Meu and the Seiche, which are both navigable.

Cenéle amus: salanaig buale ⁊ buicc brodnai ⁊ eóin erchoille ⁊ seiche corad.

Notwithstanding the strange, not to say grotesque, appearance of its beak, the Seiche is decidedly an interesting creature.

A seiche is a standing oscillation of a lake, usually in the direction of the longest diameter, but occasionally transverse.