Subbasal

subbase

[suhb-beys]
noun
1.
Architecture. the lowest part of a base, as of a column, that consists of two or more horizontal members.
2.
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 ).

Origin:
1820–30; sub- + base1

subbasal, adjective
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World English Dictionary
subbase (ˈsʌbˌbeɪs)
 
n
Compare surbase the lowest part of a pedestal, base, or skirting

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