Learn how to say Preloader correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word preload:
1 [with object] load beforehand:
the camera comes preloaded with a 24-exposure film
the package is preloaded on many home PCs
give (a mechanical component) an internal load independent of any working load, typically in order to reduce distortion or noise in operation.
2 [no object] (often as noun preloading) British informal drink large quantities of alcohol before going out socially:
preloading with cheap alcohol is at the root of a lot of crime
a thing loaded or applied as a load beforehand.