Etymology

disrotatory

D2I1S1R1O1T1A1T1O1R1Y4

Today it means: Describing an electrocyclic reaction in which the substituents at the interacting termini of the conjugated system rotate in opposite senses Full definition →

English rotatory ← Middle English dis- ← Latin dis-
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The story

  1. Latindis-
  2. Old Frenchdes-
  3. Latindis-
  4. Middle Englishdis-
  5. Englishdis-
  6. Englishrotatory
  7. English todaydisrotatory

From dis- + rotatory.

Etymology from Wiktionary, CC BY-SA 4.0.