screw augur

Từ điển WordNet v3.1 - WordNet Dictionary

noun

an orchid of the genus Spiranthes having tall erect densely flowered spiraling clusters of creamy white vanilla-scented flowers;
widely distributed especially in low damp places of eastern and central North America
• Syn:
Spiranthes cernua
• Hypernyms:
ladies' tresses, lady's tresses
• Member Holonyms:
Spiranthes, genus Spiranthes