what does crown-of-the-field mean?

CROWN-OF-THE-FIELD as NOUN

Meaning
- European annual having large trumpet-shaped reddish-purple flowers and poisonous seed
- a common weed in grainfields and beside roadways
- naturalized in America
Synonym(s)
- Agrostemma githago (what does Agrostemma githago mean?)
- corn campion (what does corn campion mean?)
- corn cockle (what does corn cockle mean?)
Hypernyms(s) crown-of-the-field is a kind of… Example: animal is a hypernym of mammal, plant is a hypernym of flower
- weed (what does weed mean?)