Longman Dictionary of Contemporary English
patio doors
noun
EXAMPLES FROM CORPUS
▪ Don't forget patio doors either.
▪ For safety and security, install laminated glass in your patio doors.
▪ If you are replacing existing patio doors, you have two options.
▪ If you have patio doors, get specialist advice.
▪ So why was she sitting here now, moodily watching the rain pelting down outside the patio doors?
▪ The easiest place for a burglar to gain access to a house is through patio doors.
▪ They broke into the house in Scotto Crescent through the patio doors and made off with several ornaments.
Wiktionary
patio doors
n. (patio door English)