Greeting that contains another greeting backward (5)

I believe the answer is:

aloha

(Other definitions for aloha that I've seen before include "Hawaiian farewell" , "A Hawaiian welcome" , "Hello from Honolulu?" , "Hawaiian "ciao"" , "Welcome to Honolulu!" .)

I've seen this clue in The New York Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.