
1) Molding 2) Moulding 3) Naval fortification 4) Road infrastructure
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https://www.crosswordclues.com/clue/subbase

In topology, a subbase (or subbasis) for a topological space X with topology T is a subcollection B of T that generates T, in the sense that T is the smallest topology containing B. A slightly different definition is used by some authors, and there are other useful equivalent formulations of the definition; these are discussed below. == Definition...
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http://en.wikipedia.org/wiki/Subbase
[pavement] In highway engineering, subbase is the layer of aggregate material laid on the subgrade, on which the base course layer is located. It may be omitted when there will be only foot traffic on the pavement, but it is necessary for surfaces used by vehicles. Subbase is often the main load-bearing layer of the pavement. Its role is to...
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http://en.wikipedia.org/wiki/Subbase_(pavement)

(from the article `roads and highways`) ...Its thickness ranges from 4 inches (10 centimetres) for very light traffic and a good natural formation to more than 40 inches (100 centimetres) ...
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http://www.britannica.com/eb/a-z/s/177

[
n] - the lowest molding of an architectural base or of a baseboard
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http://www.webdictionary.co.uk/definition.php?query=subbase
noun the lowest molding of an architectural base or of a baseboard
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https://www.encyclo.co.uk/local/20974

A layer in a pavement system between the subgrade and base course or between the subgrade and a portland cement concrete pavement.
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https://www.encyclo.co.uk/local/21122

the lowest part of a base, as of a column, that consists of two or more horizontal members. · 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. Cf. (def. 13b).
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https://www.infoplease.com/dictionary/subbase
No exact match found.