...ondular, to undulate...
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
...At last, about half-past four, we topped the swell of one of the numerous and interminable land billows that undulate across all plains countries here, and saw a few miles away the wagon outspanned...
Stewart Edward White 「African Camp Fires」
...The lower ground seemed to undulate, but no part of it was intersected by open plains or any lines of large river trees indicating the permanent existence of water...
Thomas Mitchell 「Three Expeditions into the Interior of Eastern Australia, Vol 1 (of 2)」
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