Source : WordNet®

bedrock
     n 1: solid unweathered rock lying beneath surface deposits of
          soil
     2: principles from which other truths can be derived; "first
        you must learn the fundamentals"; "let's get down to
        basics" [syn: {fundamentals}, {basics}, {fundamental
        principle}, {basic principle}]

Source : Free On-Line Dictionary of Computing

Bedrock
     
        A {C++} {class} library for {Macintosh} user interface
        portability.