‘he would grope for the words and he often apologized for his lethologica’
Like many other English terms associated with the mind, lethologica is a modern word derived from classical Greek. In this case, the Greek words are lethe (forgetfulness) and logos (word). In Greek mythology, Lethe was also one of the five rivers of the underworld where the souls of the dead drank to forget all earthly memories.
The coinage of this term is popularly attributed to psychologist Carl Jung in the early 20th Century, but the earliest clear record is in the 1915 edition of Dorland’s American Illustrated Medical Dictionary, where lethologica is defined as the ‘inability to remember the proper word’.