subblock

noun
sub·​block | \ ˈsəb-ˌbläk \
variants: or sub-block
plural subblocks or sub-blocks

Definition of subblock 

: a block that is a subdivision of a larger block: such as
a : a functional subdivision of a building or part of a building
b : a subdivision of a quantity, number, or section of things dealt with as a unit a sub-block of data

First Known Use of subblock

1857, in the meaning defined above

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The first known use of subblock was in 1857

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