Douglas Harper's Etymology Dictionary
heighth
see height.
Wiktionary
heighth
n. (lb en obsolete outside US dialects now proscribed) (alternative form of height English)
Usage examples of "heighth".
At the counter were three devotchkas dressed in the heighth of nadsat fashion, that is to say long uncombed hair dyed white and false groodies sticking out a metre or more and very very tight short skirts with all like frothy white underneath, and Bully kept saying: ‘Hey, get in there we could, three of us.