As nouns the difference between duodena and duodene
is that duodena is while duodene is (music) a schematic group of twelve notes.
duodene
English
Noun
(
en noun)
(music) A schematic group of twelve notes.
(rare) A group of twelve.
* 1963': He saw where the beer was, crated '''duodenes of it stacked between counter and wall, and went to help himself. — Anthony Burgess, ''Honey for the Bears (Norton 1996, p. 86)