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subimago

noun
sub·​imago | \"+\

Definition of subimago 

1 : a stage in the development of some insects (such as the mayflies) between the nymph and imago in which the insect is able to fly but becomes mature only after a further molt

2 : an insect in the subimaginal stage — see dun

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History and Etymology for subimago

New Latin, from sub- + imago

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