Onomatopoeia refers to a formation of words that imitate or suggest what they stand for, according to my Griffin Dictionary For Kids. That such a simple concept could be given a name that is so difficult to spell gives credence to any theories of Unnatural Complexity which happen to be passing.
Here are some examples of onomatopoeia:
Plop, splash, sploosh, splat, bang, boom, pop, purr, bark, tweet, meow, quack, squeak. These are good examples, as they conjure images of what they represent in the mind.
It has been proposed that the word snore is onomatopoeic, however my experiments have shown that this is only true if you say the word very slowly while gargling with chocolate syrup.