
• (n.) The lowest member of a base when divided horizontally, or of a baseboard, pedestal, or the like.
Found on
http://thinkexist.com/dictionary/meaning/sub-base/

On paved trails the sub-base lies between the sub-grade and the trail surface, and serves as a secondary, built foundation for the trail surface (concrete or asphalt). The purpose of the sub-base is to transfer and distribute the weight from the trail surface to the sub-grade. The sub-base consists of four- to six-inches of graded aggregate), which...
Found on
http://www.americantrails.org/

Good quality crushed and graded aggregate used as the top layer of road construction, immediately below the bitumen- or cement- bound surfacing. A valuable product, much of which is provided by primary crushed rock aggregates like granite or limestone. Crushed concrete can be processed to provide a completely satisfactory alternative.
Found on
http://www.encyclo.co.uk/local/20710

One or more layers of material placed immediately above the formation.
Found on
http://www.encyclo.co.uk/visitor-contributions.php
Sub'-base` noun (Architecture) The lowest member of a base when divided horizontally, or of a baseboard, pedestal, or the like.
Found on
http://www.encyclo.co.uk/webster/S/220
No exact match found.