Definition of pseudimago in English:
pseudimago
(also pseudo-imago)
noun ˌs(j)uːdɪˈmɑːɡəʊˌs(j)uːdɪˈmeɪɡəʊ
Entomology rare A form or stage that resembles the adult but is not a true adult; especially the subimago of a mayfly.
Origin
Mid 19th century. From pseudo- + imago.