Shakespeare used the word armgaunt in ‘Antony & Cleopatra’. What did he mean by that word?

The meaning to the word "armgaunt" which Shakespeare used to describe Antony's horse in is still ambiguous till this day; as editors are split between two meanings. The first group suggest that the word means slender, while the second group believe that Shakespeare was referring to the horse's gauntlet or armor.Personally, I agree with the second interpretation :)