building block

1. A single undivided natural thing occurring in the composition of something else (synset 109488589)
   "units of nucleic acids"
   is a type of: thing - a separate and self-contained entity
   subtypes:

   • chain, chemical chain - (chemistry) a series of linked atoms (generally in an organic molecule)
   • couple - (physics) something joined by two equal and opposite forces that act along parallel lines
   • unit cell - the smallest group of atoms or molecules whose repetition at regular intervals in three dimensions produces the lattices of a crystal
   • chemical group, group, radical - (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
   • molecule - (physics and chemistry) the simplest structural unit of an element or compound
   has: part, piece - a portion of a natural object
   same as: unit
2. A block of material used in construction work (synset 102918159)
   is a type of: building material - material used for constructing buildings
   subtypes:

   • ashlar - a rectangular block of hewn stone used for building purposes
   • breeze block, cinder block, clinker block - a light concrete building block made with cinder aggregate
   • headstone, key, keystone - the central building block at the top of an arch or vault
   • voussoir - wedge-shaped stone building block used in constructing an arch or vault

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