IPA: /ˈkɔːrləs/
KK: /ˈkɔrˌlɛs/
Not having a central part or core.
The coreless design of the product makes it lighter and easier to handle.
Coreless → It is formed from "core" (from Old French *cor*, meaning the central or most important part) and "-less" (meaning without). The word "coreless" means without a core or central part.
Think of something that is 'without' ('-less') a 'core' — that's why coreless means lacking a central part.