The term 'alethiology' is rare. The ten volume Routledge Encyclopedia of Philosophy mentions it only once, in the article 'Lambert, Johann Heinrich (1728-77)':
Part Two of the Neues Organon is the ‘Alethiology or Doctrine of Truth’. Lambert’s key concern here is with the nature and function of the simple concepts that serve as the building blocks for the logical construction of true propositions.'
The Encyclopædia Britannica Eleventh Edition describes the discipline as "…an uncommon expression for the doctrine of truth, used by Sir William Hamilton in his philosophic writings when treating of the rules for the discrimination of truth and error.