Architecture. the lowest part of a base, as of a column, that consists of two or more horizontal members.
Mathematics. a collection of subsets of a topological space having the property that every open set of a given topology can be written as the union of intersections of finite numbers of sets in the collection. Compare base1 ( def 13b ).

1820–30; sub- + base1

subbasal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
subbase (ˈsʌbˌbeɪs)
Compare surbase the lowest part of a pedestal, base, or skirting

subbass or subbase (ˈsʌbˌbeɪs)
another name for bourdon
subbase or subbase

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The purpose of a subbase under a rigid pavement is to provide uniform stable
  support for the pavement slabs.
Any selected course of material placed beneath the base is referred to as a
There shall be no snow, frost, or standing water on the subbase course.
The subbase surface shall be contoured to lines and grades indicated on the
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