PEA

noun (plural ~s; also ~se) Usage: often attributive Etymology: back-formation from Middle English ~se (taken as a plural), from Old English pise, from Latin pisa, plural of pisum, from Greek pison Date: 1611 1. a variable annual Eurasian vine ( Pisum sativum ) of the legume family that is cultivated especially for its rounded smooth or wrinkled edible protein-rich seeds, the seed of the ~, the immature pods of the ~ with their included seeds, any of various leguminous plants related to or resembling the ~, something resembling a ~ (as in size or shape)