Wiktionary
submodule
n. 1 A module making up part of a larger module. 2 (context algebra English) A module contained in a larger module, both over the same ring, such that the ring multiplication in the former is a restriction of that in the latter.
Usage examples of "submodule".
After a certain degree of probing he found that the viral submodules were assembled in a pattern like that of a three dimensional rubik puzzle.