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).
Origin of -eous
< Latin -eus; see -ous
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suffix forming adjectives
Word Origin for -eous
from Latin -eus
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012