sour grass

Từ điển WordNet v3.1 - WordNet Dictionary

noun

any of certain coarse weedy plants with long taproots, sometimes used as table greens or in folk medicine
• Syn:
dock, sorrel
• Hypernyms:
herb, herbaceous plant
• Hyponyms:
sour dock, garden sorrel, Rumex acetosa, sheep sorrel, sheep's sorrel,
sheep's sorrel, bitter dock, broad-leaved dock, yellow dock, Rumex obtusifolius,
French sorrel, Rumex scutatus
• Member Holonyms:
Rumex, genus Rumex