[1805–15; ‹ L aēneus, equiv. to aēn(us) of bronze (ae(s) bronze + -n- adj. suffix) + -eus-eous]This word is first recorded in the period 1805–15. Other words that entered Englishat around the same time include: backlash, makeup, one-sided, platinum, soufflé-eous is an adjectival suffix with the meanings “composed of,” “resembling, having thenature of,” occurring in loanwords from Latin (igneous; ligneous; vitreous); it is also found as a semantically neutral suffix on adjectives of diverse origin(beauteous; courteous; hideous; homogeneous; plenteous; righteous)