knoll

noun
🔊/nəʊl/
🔊/nəʊl/
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  1. a small round hill圆丘;土墩 synonym moundTopics Geographyc2
    Word OriginOld English cnoll ‘hilltop’, of Germanic origin; related to German Knolle ‘clod, lump, tuber’ and Dutch knol ‘tuber, turnip’.