Definition of flat pea
1a : a European perennial pea (Lathyrus sylvestris) sometimes cultivated for fodder or as a green-manure crop
b : the seed of the flat pea
2 : any of several Australian evergreen leguminous shrubs that constitute a small genus (Platylobium) and are sometimes cultivated in warm regions for their bright yellow pealike flowers
required by fashion, etiquette, or custom
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