Google comes up with these definitions for Pod
An enclosure, housing, or detachable container of some kind, as an engine pod.
the vessel that contains the seeds of a plant (not the seeds themselves)
And from now on it should also have:
a pod is a device that moves away from the mothership, as in space craft with with smaller more mobile vessels for exploratory missions. And since 2004, a pod is any mobile device that uses the personal computer for docking e.g., PDAs, Smart Phones, Digital Cameras and mp3 players.