Not ‘a podcast’.
‘podcast’.
It’s iPod Broadcast.
Blog comes from weblog. Comes from web log.
Book comes from the German word bōk (beech), the wood on which runes were inscribed.
Magazine comes from Roman names for storehouse; e.g. the French – Magasin. It’s a storehouse of information.
Television comes from viewing (vision: the act of seeing) images over distance (tele).
Words come and go. Times come and go. Technology comes and goes.
In the end, it’s the technology that is able to store, reproduce and evolve content the best, that stands the test of time.