WordNet (r) 3.0 (2006):

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, bedrock]

Moby Thesaurus II by Grady Ward, 1.0:

119 Moby Thesaurus words for "bedrock":
   aa, abyssal rock, basalt, base, basement, basic, basis,
   bearing wall, bed, bedding, belly, block lava, bottom, bottom side,
   bottommost, brash, breccia, breech, buttocks, central,
   conglomerate, crag, deepest, downside, druid stone, essential,
   festooned pahoehoe, floor, flooring, focal, fond, footing,
   foundation, fundament, fundamental, gneiss, granite, ground,
   grounds, groundwork, hardpan, igneous rock, indispensable,
   infrastructure, lava, life-and-death, life-or-death, limestone,
   living rock, lower side, lower strata, lowest, lowest layer,
   lowest level, lowest point, magma, mantlerock, material,
   metamorphic rock, monolith, nadir, nether side, nethermost,
   nethermost level, of vital importance, pahoehoe, pavement, pillar,
   pillow lava, porphyry, principle, pudding stone, radical, regolith,
   riprap, rock, rock bottom, rock-bottom, root, ropy lava, rubble,
   rubblestone, rudiment, sandstone, sarsen, schist, scoria, scree,
   seat, sedimentary rock, shelly pahoehoe, sill, solid ground,
   solid rock, stereobate, stone, stylobate, substantive, substratum,
   substruction, substructure, talus, terra firma, tower, tufa, tuff,
   underbelly, underbuilding, undercarriage, undergirding, underlayer,
   underlying level, undermost, underneath, underpinning, underside,
   understruction, understructure, vital



The Free On-line Dictionary of Computing (30 December 2018):

Bedrock

   A C++ class library for Macintosh user interface
   portability.