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

 

millpond

 noun
noun
BrE BrE//ˈmɪlpɒnd//
 
; NAmE NAmE//ˈmɪlpɑːnd//
 
Rivers and lakes
 
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a small area of water used especially in the past to make the wheel of a mill turn The sea was as calm as a millpond. See related entries: Rivers and lakes
See the Oxford Advanced American Dictionary entry: millpond