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-eous

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  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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Origin of -eous

< Latin -eus; see -ous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for -eous

-eous

suffix forming adjectives
  1. relating to or having the nature ofgaseous Compare -ious
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Word Origin

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