the immature green pod of the kidney bean, eaten as a vegetable.
Origin of green bean
An Americanism dating back to 1940–45
Also called string bean, stringless bean.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for green bean
any bean plant, such as the French bean, having narrow green edible pods when unripe
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012