Engine Versus Motor

I know I should be studying (I have a paper at 2:30 pm) but an interesting question popped out of a normal conversation.

What is the difference between an engine and a motor?

Some would say that an engine consumes fuel and motor is driven by electricity. But by further searching in Google shows that there are other types of motors as well such as thermodynanmic motor, hydraulic motor, molecular motor, etc. Electric motor is just one of them.

Besides, why is Google called a search engine when it does not consume any fuel?

And why are motorcars, motorcycles and motorboats powered by 'engines'?

What about Motorola? (The company adopted the "motor-" prefix because its initial business was making car radios.)

Here is a good article that I found from Google. Seems like there is no clear-cut distinction between the words although their usage had been pretty much fixed by the norms.

Yes, I'm a bit obsessed about using the right words. It always amazes me how most people use words without knowing the actual meaning, hence using the words wrongly. Worse are those who try to impress others with their so-called 'superior vocabulary'. It never cease to amuse me when these people use some bombastic and superfluous words to impress others, only to prove to me that they are more idiotic than I thought they were.

Ok, enough procrastination for now. I highly doubt that the lecturers for Engineers and Society will be keen to know the difference between an engine and a motor.

(Did I mention that their notes suck?)