| Subject | English | Japanese |
| gen. | amount os percolation | 浸透量 |
| gen. | n cervical os | 子宮口 |
| comp., MS | custom OS image | カスタム OS イメージ (The user-customized virtual hard disks (VHDs) that define the operating environment hosted by the VM role) |
| comp., MS | guest OS | ゲスト OS (The operating system running on a virtual machine) |
| comp. | n OS-2 | オーエスツー |
| geogr. | Os-sjoen | オース湖 (lake) |
| gen. | n os trapezium | 大菱形骨 |
| comp., MS | OS upgrade mode | OS アップグレード モード (The options for applying guest OS upgrades to the VMs. Available options are automatic, in which the OS is upgraded whenever a new guest OS is released in Windows Azure, and manual, in which the user chooses when to upgrade the VMs and what guest OS version to upgrade to) |
| gen. | n os uteri | 子宮口 |
| comp. | n OS-2 Warp | オーエスツーワープ |
| geogr. | Tras Os Montes | トラスオスモンテス |
| comp., MS | Windows OS Loader | Windows OS ローダー (A Boot Configuration Data (BCD) application object) |