pea /piː/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Origin: pease 'pea' (11-19 centuries) (mistaken as plural), from Latin pisa , plural of pisum , from Greek pison ]
1 . a round green seed that is cooked and eaten as a vegetable, or the plant on which these seeds grow:
roast chicken with peas and carrots
2 . like two peas in a pod informal exactly the same in appearance, behaviour etc