单词	knapweed
释义	knapweed noun knap·​weed ˈnap-ˌwēd  : any of various weedy centaureas especially : a widely naturalized European perennial (Centaurea nigra) with tough wiry stems and knobby heads of purple flowers Example Sentences Recent Examples on the Web The Pull Your Share movement, started by Great Falls High teacher Dan Wilkins three years ago, encourages people to spend five to 15 minutes on their trips pulling out noxious, nonnative knapweed at campgrounds and other sites. USA TODAY, 14 June 2019 Invasives mainly on roadsides: Cutleaf teasel, wild parsnip,spotted knapweed, phragmites, leafy spurge, Canada thistle and crown vetch. Joanne Kempinger Demski, Milwaukee Journal Sentinel, 20 Aug. 2017 Word History Etymology Middle English knopwed, from knop knop + wed weed First Known Use 15th century, in the meaning defined above Phrases Containing knapweed spotted knapweed spotted knapweed
随便看	tighteners tightening tightening up tightenings tightens tightens up tighter tightest tightfisted tightfistedness tightfistednesses tightish tightlier tightliest tightlining tightlock tightly tightness tightnesses tightrope tightroped tightropes tightroping tights tightwad

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