Pronunciation varies by accent · noun
Any of genus Lachnagrostis of common slender, upright, tufted, light to yellow green, annual or short-lived perennial grasses up to 700 mm tall, often found as an urban weed, especially in waste land around puddles and in muddy ground, or around lakes, and fringing ponds, streams and on wetland margins and coastal areas..
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Windgrass means Any of genus Lachnagrostis of common slender, upright, tufted, light to yellow green, annual or short-lived perennial grasses up to 700 mm tall, often found as an urban weed, especially in waste land around puddles and in muddy ground, or around lakes, and fringing ponds, streams and on wetland margins and coastal areas..
Common synonyms include blown-grass.
The opposite depends on the specific sense.
Use windgrass where its definition matches the intended context.
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