Dictionary

missing link

noun

: something that you do not have and that you need to complete a series or to solve a problem

the missing link : a kind of animal that was in some ways like an ape and in some ways like a human being and that is thought to have existed in the past but has not been discovered

Full Definition of MISSING LINK

1
:  an absent member needed to complete a series or resolve a problem
2
a :  a hypothetical intermediate evolutionary form between humans and their presumed simian progenitors
b :  a hypothetical intermediate evolutionary form between one animal species or group and its presumed ancestors <a missing link between reptiles and birds>
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First Known Use of MISSING LINK

1851

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