scouring rush

Từ điển WordNet v3.1 - WordNet Dictionary

noun

evergreen erect horsetail with rough-edged stems;
formerly used for scouring utensils
• Syn:
rough horsetail, Equisetum hyemale, Equisetum hyemale robustum, Equisetum robustum
• Hypernyms:
horsetail