Dictionary

subbase

noun sub·base \ˈsəb-ˌbās\

Definition of SUBBASE

:  underlying support placed below what is normally construed as a base: as
a :  the lowest member horizontally of an architectural base or of a baseboard or pedestal
b :  pervious fill (as crushed stone) placed under a roadbed
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First Known Use of SUBBASE

1826

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