Definitions for "Subshell"
Atomic orbitals for which the values of the n and l quantum numbers are the same, such as the three 2p or five 3d atomic orbitals.
a set of electron orbitals with the same principal and second quantum number; for example, 2, and so on.
a set of orbitals with a given azimuthal quantum number
Shell running under the control of another, often referred to as the parent shell (typically the login shell). See shell.
a forked child shell that executes a command and then exits
a new shell your current shell creates to run a program