库房 (kù fáng) is a compound noun meaning 'warehouse' or 'storage room'. The character 库 (kù) originally meant 'storehouse' or 'treasury', and often appears in words related to storage, inventory, or reserves (e.g., 数据库 shùjùkù 'database'). The character 房 (fáng) means 'room' or 'building', emphasizing the physical space. Together, 库房 specifically refers to a designated indoor area—often in factories, shops, offices, or logistics centers—used for holding goods, supplies, equipment, or archived materials before distribution or use.

Unlike more general terms like 仓库 (cāngkù), which can refer to larger, standalone facilities (including outdoor yards), 库房 tends to imply a smaller, enclosed, functional room within a building—sometimes even a repurposed office or basement space. It carries a neutral, practical tone and is commonly used in business, logistics, and administrative contexts, but rarely in casual daily speech about home storage (where 储藏室 chǔcángshì is preferred).