Other forms: storerooms
A storeroom is a room where things are kept until needed. The back storeroom, lock the storeroom, a cluttered storeroom.
Every organisation has one that nobody has emptied for years, which is where the genuinely useful and the entirely useless sit side by side. It is a different word from a storage unit, which is rented rather than part of a building.
1nounstoreroomA room where things are kept until needed.
“Extra chairs and tables are kept in the storeroom behind the hall.”
storeroom is a room.
Store plus room, from Old French estorer, to supply or stock.
From store + room.
Etymology from Wiktionary, CC BY-SA