- The definition of a knoll is a small hill or mound.
An example of a knoll is a small, grassy hill on a college campus.
A grass covered knoll.Licensed from iStockPhoto
Origin: Middle English from Old English cnoll, akin to German knollen, lump, clod: for Indo-European base see knot
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Origin: Middle English knol, from Old English cnoll.
Archaicverb knolled, knoll·ing, knolls verb, intransitive
Origin: Middle English knollen, probably alteration of knellen, to knell; see knell.