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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How to use -eous in a sentence
Self′-rev′erent; Self′-right′eous, righteous in one's own estimation: pharisaical.
Consanguine, kon-sang′gwin, adj. related by blood: of the same family or descent—also Consanguin′eous.
Membranous or eous: composed of membrane or skin-like tissue.Explanation of Terms Used in Entomology | John. B. Smith
British Dictionary definitions for -eous
relating to or having the nature of: gaseous Compare -ious
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