what does moon trefoil mean?

MOON TREFOIL as NOUN

Meaning
- evergreen shrub of southern European highlands having downy foliage and a succession of yellow flowers throughout the summer followed by curious snail-shaped pods
Synonym(s)
- Medicago arborea (what does Medicago arborea mean?)
Hypernyms(s) moon trefoil is a kind of… Example: animal is a hypernym of mammal, plant is a hypernym of flower
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