Douglas Harper's Etymology Dictionary
Wiktionary
sub-category
n. (alternative spelling of subcategory English)
Usage examples of "sub-category".
The user can zoom in and out of sub-categories and "unlock" their contents.
She jotted a note to create sub-categories for domestic operations of the liedburg, as opposed to similar costs for Hanfor's forces.
This last group had two sub-categories -- acceptable and unacceptable.