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Webster 1913 Edition

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Adj.

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Deviating from ordinary forms or rules; irregular; anomalous; abnormal.

heteroclitical ‎(comparative more heteroclitical, superlative most heteroclitical)

(obsolete) Anomalous, heteroclite.
- 1621, Robert Burton, The Anatomy of Melancholy, II.4.1.iv:
  those loathsome and fulsome filthy potions, heteroclitical pills (so he cals them), horse medicines […].