Any unwanted plant that grows among grass or in grassy areas, competing with desirable grass.
A straightforward compound of 'grass' and 'weed,' both from Old English. The term emerged to distinguish weeds that specifically invade grass-covered areas rather than other plants.
Grassweed shows how practical our ancestors were—they had specific names for pests in specific places, meaning medieval gardeners were already frustrated with dandelions in their lawns just like we are today.
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