Hawaiian fruit? (3)

I believe the answer is:
haw
This might be a double definition.
'hawaiian' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'fruit?' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for haw that I've seen before include "A blackthorn berry" , "Fruit of the may tree" , "Fruit of the hawthorn" , "Fruit of common thorn tree (3)" , "Small red berry of a thorny tree" .)
