-eous

American  

1. 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 ).

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-eous British  

suffix

1. relating to or having the nature of Compare -ious

   gaseous

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Etymology

Origin of -eous

< Latin -eus; see -ous