a bootable medium which contains a self-sustained Gentoo environment
a CD-ROM (or by extension a DVD-ROM or USB key) which allows a computer to boot from it directly
a CD that boots into a complete GNU/Linux environment
a CD that contains an entire operating system, that runs purely off of the cd, without modifying the hard drive
a CD that is able to boot your system into a 'live', working operating system, independent of anything on your hard drive
a CD which you are able to boot off like a floppy boot disk BU
an operating system complete with software that is stored on a bootable drive (such as a CD-ROM)
an operating system installed on a CD in such a way that it can be used to boot a computer into that operating system without any installation onto the hard drive of that computer being necessary
an operating system (plus other software) stored on a bootable CD-ROM from which the OS can be executed without having to go through time-consuming installation
an operating system stored on a bootable CD-ROM that can be executed from it, without installation into a hard drive
an operating system (that usuallycontains other software as well) stored on a bootable CD-ROM that can be executed from it, without installation on a harddrive
an operating system (usually containing other software as well) stored on a bootable cd-rom that
an OS that you run out of RAM and doesn't need to be installed to your HDD
a simple and painless way of auditioning Linux without the hassle of installation