Merriam-Webster Dictionary:
noun
Inflected Form(s): plural at·o·mies
Etymology: irregular from Latin atomi, plural of atomus atom
Date: 1591
: a tiny particle
"Hey!" he said, "why it's you, Tom! I suppose you have come here to laugh at me, you spiteful little atomy."
_Water Babies - Charles Kingsley, 1937
Merriam-Webster Dictionary:
noun
Inflected Form(s): plural at·o·mies
Etymology: irregular from Latin atomi, plural of atomus atom
Date: 1591
: a tiny particle
"Hey!" he said, "why it's you, Tom! I suppose you have come here to laugh at me, you spiteful little atomy."
_Water Babies - Charles Kingsley, 1937