subminimum

adjective
sub·​min·​i·​mum | \ ˌsəb-ˈmi-nə-məm How to pronounce subminimum (audio) \
variants: or sub-minimum

Definition of subminimum

: having or providing less than a specified minimum The ore shipment was rejected for subminimum uranium content …The New York Times … like most of the other early minimum wage laws, the Massachusetts law allowed for subminimum wages [=wages below a legally fixed minimum wage] for learners and children …— Clifford F. Thies

First Known Use of subminimum

1817, in the meaning defined above

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