Definition of whatsis in English:

whatsis

Syllabification: whats·is
Pronunciation: /ˈ(h)wətsəs, ˈ(h)wät-/

Entry from US English dictionary

noun

informal
Used to refer to a thing whose name one cannot recall, does not know, or does not wish to specify: I am up to my whatsis in snow and slush

Definition of whatsis in:

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Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal