fireguard
fi·re·guard
noun
1.
2.
an exterior door divided in two horizontally; either half can be closed or open independently
Origin
From fire + guard.
Related words
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.