bitterweed

Từ điển Oxford Learners Wordfinder Dictionary

noun

1. widespread European weed with spiny tongue-shaped leaves and yellow flowers;
naturalized in United States
• Syn:
oxtongue, bristly oxtongue, bugloss, Picris echioides
• Hypernyms:
weed
• Member Holonyms:
Picris, genus Picris
2. any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
• Syn:
ragweed, ambrosia
• Hypernyms:
weed
• Hyponyms:
common ragweed, Ambrosia artemisiifolia, great ragweed, Ambrosia trifida, western ragweed,
perennial ragweed, Ambrosia psilostachya
• Member Holonyms:
genus Ambrosia