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The stone louse or Petrophaga lorioti, a fictitious animal invented by the German humorist Loriot, is probably the most famous entry in Pschyrembel. Loriot's zoological contribution did not appear in the clinical dictionary until 1983, however. At that point, the Pschyrembel was already 90 years old.

We have studied the Wörterbuch der Klinischen Kunstausdrücke, as the predecessor to the Pschyrembel was known, for the strangest and oldest medical terms. Some definitions from the 1893 edition of the dictionary do indeed cause wrinkling of the forehead.

1. Onanism
(Named after Onan, see Genesis Chapter 36 Verse 9) Self-abuse; not so much the cause of mental disorders, as a common propensity in genetically abnormal individuals

2. Longing
Cravings of a gravida

3. Querulous paranoia
Lat. Paranoia querulans: litigiousness, a mental disorder suffered by (inferior) individuals with a hereditary personality disorder, as a result of which they draw upon an actual or perceived injustice that they have suffered and seek to do battle with their supposed persecutors by every conceivable means, without being responsive to instruction, and with progressive development of their delusion (transition to paranoia)

4. Tattooing
Pigmentation of moles and patches of horny skin by the rubbing of pigment into fine pricks (the term originates from the South-Sea islanders). Tattooing of the skin is an abnormal propensity among criminals.

5. Clinomia
Propensity of melancholy and feeble-minded invalids to remain permanently in bed.

6. Aztec type
Cranial and facial formation similar to that of Aztecs, occasionally observed in idiots.

7. Railway-brain, railway-spine
Neurotic disorders caused by railway accidents.

We should be grateful that the current, 266th edition of the Pschyrembel contains only validated, up-to-date medical knowledge!