Or is just any IC considered a computer chip?
So a resistor array alone is a pretty useless computer chip
Yes, in my opinion the mass media most likely thinks that any integrated circuit device be best described as a 'computer chip'. It's not the worst media does in trying to communicate technical/scientific information to the general public in my opinion.
Sure, it's any chip (IC) that could conceivably be used to implement a computer.http://en.wikipedia.org/wiki/Computer_chip
"Computer Chip" on Wikipedia takes you to Integrated Circuit, the more formal term.