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diminutive suffix
diminutive suffix UK US noun [countable] [singular diminutive suffix plural diminutive suffixes] linguistics
a group of letters that are added to the end of a word to show that something is smaller than things of that type usually are, for example ‘-let’ added to ‘drop’ to make ‘droplet’
Thesaurus: suffixeshyponym linguistic terms relating to word formation and phrase buildinghyponym

Useful english dictionary. 2012.