The addition of -ous to L. stems of many types became the commonest mode of anglicizing L. adjs. ending in -eus, -ius, -uus, -āci-, -ōci-, -endus, -ulus, -ōrus, etc., e.g. aqueous, atrocious, nefarious, stupendous, garrulous, and of forming adjs. directly from sbs. of all origins; see also -EOUS, -IOUS, -UOUS; rel. sbs. have -OSITY.
In chem. -ous indicates a larger proportion of the element denoted by the stem than the termination -ic, as cuprous, ferrous.
"-ous." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (April 20, 2019). https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ous
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