subbasin

noun
sub·​ba·​sin | \ ˌsəb-ˈbā-sᵊn How to pronounce subbasin (audio) \
variants: or sub-basin
plural subbasins or sub-basins

Definition of subbasin

: 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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The first known use of subbasin was in 1832

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