individuum
noun
in·di·vid·u·um
ˌindəˈvijəwəm
plural individua
-wə
or individuums 1
: an individual instance or an individual being as distinguished from a group of similar instances or beings
2
[Latin] : an indivisible entity
specifically : atom sense 1a
Word History
Etymology
Late Latin, from Latin, indivisible entity, atom, from neuter of individuus indivisible
First Known Use
15th century, in the meaning defined at sense 1