Etymology

spiran

S1P3I1R1A1N1

Today it means: Any of a class of bicyclic hydrocarbons in which a carbon atom has two single bonds in each of two rings; a form of spiro compound Full definition →

German Spiran
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The story

  1. German · borrowed fromSpiran
  2. English todayspiran

From German Spiran. By surface analysis, spiro- + -an.

Etymology from Wiktionary, CC BY-SA 4.0.