Definition of chrono- combining form from the Oxford Advanced Learner's Dictionary

 

chrono-

 combining form
combining form
BrE BrE//ˈkrɒnəʊ//
 
; NAmE NAmE//ˈkrɑːnoʊ//
 
 
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(in nouns, adjectives and adverbs) connected with time chronological Word Originfrom Greek khronos ‘time’.
See the Oxford Advanced American Dictionary entry: chrono-