subunit

noun
sub·​unit | \ ˈsəb-ˌyü-nət How to pronounce subunit (audio) \
variants: or less commonly sub-unit
plural subunits also sub-units

Definition of subunit

: a unit that is part of a larger unit : a subdivision of a unit In the U.S. Army's case … the smallest subunit is the squad (nine to twelve individuals under a sergeant).— Norman Friedman Because of a quirk in the replicative machinery, when a strand of DNA is duplicated during mitosis, a few subunits at one end are always lost.— John Rennie

First Known Use of subunit

1852, in the meaning defined above

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The first known use of subunit was in 1852

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subunit

noun
sub·​unit | \ ˈsəb-ˌyü-nət How to pronounce subunit (audio) \

Medical Definition of subunit

: a unit that forms a discrete part of a more comprehensive unit subunits of a protein

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