a door having glass panes throughout or nearly throughout its length.
Origin of French door
First recorded in 1920–25
Also called casement door.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
US and Canadian a pair of casement windows extending to floor level and opening onto a balcony, garden, etcAlso called (in Britain and certain other countries): French windows
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