IPA: //sʌbˈfræɡmənt//
KK: /sʌbˈfræɡmənt/
A smaller part of a larger piece that has already been broken or divided.
The scientist studied the subfragment of the DNA to understand its function better.
Subfragment → It is formed from "sub-" (meaning under or below) and "fragment" (from Latin "fragmentum", meaning a piece or broken part). The word "subfragment" refers to a piece that is part of a larger fragment, or a smaller piece that is beneath or part of a broken section.
Think of something that is a smaller piece ('fragment') that is 'under' ('sub-') a larger piece — that's what a subfragment is.