IPA: /ˈsuːpərˌklæs/
KK: /ˈsuːpərˌklæs/
A group in biological classification that is higher than a class and lower than a phylum, used to organize related organisms.
In the classification of animals, mammals belong to the superclass called Tetrapoda.
Superclass → It is formed from "super-" (meaning above or over) and "class" (from Latin "classis", meaning a division or group). The word "superclass" refers to a class that is above or encompasses other classes.
Think of something that is 'above' ('super-') a certain 'group' or 'division' ('class') — that's why superclass means a higher class.