annulation

noun
an·​nu·​la·​tion | \ˌan-yə-ˈlā-shən \

Definition of annulation 

: a ringlike anatomical structure

First Known Use of annulation

1794, in the meaning defined above

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Dictionary Entries near annulation

Annulata

annulate

annulated column

annulation

annule

annulene

annulet

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The first known use of annulation was in 1794

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