1 word for AABEEHIILNNNOORRSSSSTTU 23-letter words

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23 letters (1)

Slit in the back of a jacket
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Hint 1 meaning
The anal opening of certain invertebrates and fishes; also, the external cloacal opening of reptiles, birds, amphibians, and many fishes.
Hint 2 anagram
TNEV
Hint 3 another clue
Discharge
4 +1