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-es1

  1. a plural suffix occurring in loanwords from Greek: Hyades.
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Origin of -es1

From the Greek suffix -es

-es2

  1. variant of -s2 in verbs ending in s, z, ch, sh, or post-consonantal y: passes; buzzes; pitches; dashes; studies.
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-es3

  1. variant of -s3 in nouns ending in s, z, ch, sh, or post-consonantal y, and in nouns in f with v in the plural: losses; fuzzes; riches; ashes; babies; sheaves.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for -es

-es

suffix
  1. for nouns ending in ch, s, sh, z, postconsonantal y, for some nouns ending in a vowel, and nouns in f with v in the plural, a variant of -s 1 ashes; heroes; calves
  2. for verbs ending in ch, s, sh, z, postconsonantal y, or a vowel, a variant of -s 1 preaches; steadies; echoes
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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