As was mentioned in an earlier post, an onomatopoeia is a word that imitates the natural sound of something. The word essentially creates the sound effect of the thing that it describes.
When Ralph is secretly speaking with Sameric at Jack's camp, Golding utilizes an onomatopoeia to describe the sound of the meat cooking on the fire by writing the word, "—crackling—" (204).
When Ralph holds an assembly, he tells the boys that they will have lots of rules. The boys become excited and Golding employs several onomatopoeias to describe their various reactions: “Bong!” (45).
There are also several sound effects that appear in the story.
When Ralph mimics the effects of a machine-gun, he playfully aims at Piggy and yells, "Sche-aa-ow!” This would be considered one example of an onomatopoeia.
In Chapter 1, Ralph walks up the edge of the water and notices a school of fish. Golding employs an onomatopoeia to describe the sound of elation that Ralph makes by writing, "Ralph spoke to himself, sounding the bass strings of delight. 'Whizzoh!'" (14).
When Ralph is describing how he hit the pig in its snout with his spear, Maurice mentions that he saw Ralph in action. Golding utilizes an onomatopoeia by writing, "I saw you. Right bang on his snout—'Wheee!'" (162).