affix
definition
a morpheme that is attached to a word to modify its meaning or create a new word
example
In English, the suffix 'ly' is an affix that transforms adjectives into adverbs, such as 'quick' into 'quickly'.
synonyms
attachmentmodifieraddition
word origin — from Latin 'affixus', past participle of 'affigere', meaning 'to fasten to'