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Classic usage
Reading level: hard
Estimated CEFR level: C1 — Advanced
Estimated from word frequency; not an official CEFR classification.
From Middle English knol, knolle, from Old English cnoll (“summit”), from Proto-Germanic *knudan-, *knudla-, *knulla- (“lump”), possibly related to cnotta. Related to Old Norse knollr (found only in names of places), Dutch knol (“tuber”), Swedish knöl (“tuber”), Danish knold (“hillock, clod, tuber”) and German Knolle (“bulb”).
mound, hillock, hummock, hammock
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Classic usage
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