[lawng-cheyn, long-]
adjective Chemistry.
pertaining to molecules composed of long chains of atoms, or polymers composed of long chains of monomers.


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World English Dictionary
chem having a relatively long chain of atoms in the molecule

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Example sentences
The long-chain fatty acid is essential to eyesight development and seems to
  increase information processing in infants.
That's because reptiles and fish are particularly rich in long-chain
  polyunsaturated fatty acids.
Digesters do a poor job of processing long-chain fatty acids, leaving behind a
  thick layer of fat at the end of digestion.
The dark material is dust: long-chain molecules that absorb starlight.
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