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building block
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Tweet n. 1. A block used as a building material, especially a cinder block. 2. A small wooden or plastic cube used as a building toy. 3. A basic element or part of something: Amino acids are the building blocks of proteins. |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
