| Subject | English | Portuguese |
| law | coitus per os | coito oral |
| IT, dat.proc. | copy from DOS/OS2/UNIX | copiar de DOS/OS2/UNIX |
| comp., MS, Braz. | custom OS image | imagem do sistema operacional personalizada (The user-customized virtual hard disks (VHDs) that define the operating environment hosted by the VM role) |
| IT, dat.proc. | DOS/OS2 environment variable | variável de ambiente DOS ou OS2 |
| comp., MS, Braz. | guest OS | SO convidado (The operating system running on a virtual machine) |
| comp., MS, Braz. | Mac OS | Mac OS (The name given to the Macintosh operating system, beginning with version 7.5 in September 1994, when Apple started licensing the software to other computer manufacturers) |
| comp. | mobile OS | sistema operativo móvel |
| commun. | OS provider | fornecedor de serviços de operador |
| industr., construct., chem. | OS-type preservative | produto de preservação solúvel em óleo |
| comp., MS, Braz. | OS upgrade mode | modo de atualização do sistema operacional (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) |
| med. | sphenoidal angle of the parietal os | ângulo esfenoide parietal (angulus sphenoidalis ossis parietalis) |
| comp., MS, Braz. | Windows OS Loader | Carregador de Sistema Operacional do Windows (A Boot Configuration Data (BCD) application object) |
| comp., MS | Windows OS Loader | Carregador do Sistema Operativo Windows (A Boot Configuration Data (BCD) application object) |