The phrase "fragment size" refers to the length or size of broken or divided pieces of something. It is used to describe how large or small these pieces are after being broken apart or separated from the whole. Full definition
Furthermore, due to the variation in fragment sizes of sheared DNA, insert sizes add further distinction for different molecules, allowing for read depths of 1000x or more after de-duplication for paired - end reads. (massgenomics.org)
BLASTN BLASTP Design Primers Restriction Fragment Map Restriction Fragment Sizes Six - Frame Translation (yeastgenome.org)
Together, the findings support the idea that sorting for smaller DNA fragment size could increase the sensitivity of liquid biopsies for tracking many different types of cancers. (sciencedaily.com)