subbasin

noun sub·ba·sin \ ˌsəb-ˈbā-sᵊn \
variants: or sub-basin

Definition of subbasin

plural subbasins or sub-basins
: a geological basin formed within or as part of another basin
  • sediment samples taken from the subbasins of the watershed

First Known Use of subbasin

1832

in the meaning defined above

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