English
equinely
From equine + -ly.
Formed from equine + -ly
Proto-Indo-European *h₁eḱ-
…
Proto-Indo-European *h₁éḱwos ‘stallion, horse’
Proto-Italic *ekwos ‘horse’
Latin equus ‘horse’
Latin equīnus ‘of or pertaining to horses’
English equine
Today it means
adv In an equine manner.
Language periods are conventional ranges, not dates for this word.
Etymograph / equinely