an adjectival suffix
with the meanings “composed of,” “resembling, having the nature
of,” occurring in loanwords from Latin (igneous; ligneous; vitreous);
also, as a semantically neutral suffix, found on adjectives
of diverse origin, sometimes with corresponding nouns
ending in -ty2, (beauteous; courteous; hideous; homogeneous; plenteous; righteous).
< Latin -eus;