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bedrock

bed·rock

bedrock

 
pronunciation:
bed rak
features:
Word Combinations (noun), Word Explorer
part of speech: noun
definition 1: the solid layer of rock in the earth's surface, usu. beneath soil, sand, gravel, or the like.
similar words:
rock
definition 2: a bottom layer or foundation; base.
similar words:
bottom
definition 3: fundamental principles or ideals.
His belief in the value of the family was the bedrock of his social philosophy.
similar words:
bottom
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  earth, rock, stone