a long narrow seed container that grows on various plants, especially peas and beans.——朗文当代大辞典

An elongated, seed-bearing fruit formed from a single carpel that splits along the sides on ripening; spec. that of plants of the families Brassicaceae ( Cruciferae) and Fabaceae ( Leguminosae) (as the pea or bean plant); (more widely) such a fruit of other plants, esp. a hollow one (as that of the cacao tree, poppy or capsicum pepper).——牛津当代大辞典  @en