Definition of tiddler noun from the Oxford Advanced Learner's Dictionary

 

tiddler

 noun
noun
BrE BrE//ˈtɪdlə(r)//
 
; NAmE NAmE//ˈtɪdlər//
 
(British English, informal) Fish
 
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a very small fish See related entries: Fish Word Origin late 19th cent.: perhaps related to tiddly ‘very small’ or tittlebat, a childish form of stickleback.