Wiktionary
subsample
n. 1 A smaller portion of an original sample, created by trimming, subdividing, splitting or discrete collection of the original sample. 2 (context sciences English) A portion of the original sample that is representative in nature to that of the original sample, thereby assuring equivalency in results from tests and analysis either upon the subsample or the original material, independent of their size. vb. (context transitive English) To take subsamples from.
Usage examples of "subsample".
There is a computer database on all eighty thousand subsamples, and handwritten notes and photographs on each one are stored in a fire-proof vault.