Where does “psychotherapeutical” come from?

psychotherapeutical (English) comes from English therapeutical, from English -ál, from English aldehyde, from German Aldehyd, from Latin alcohol, from Andalusian Arabic كُحُول, from Arabic كحل, from Arabic كُحْل — kohl, antimony paste.

Ancestry of “psychotherapeutical”, step by step

psychotherapeutical traces back through two separate lines of ancestry.

via English therapeutical

StepLanguageWordMeaning
1Englishtherapeuticaltherapeutic; Such an agent
2English-álOf or pertaining to. Adjectival suffix appended to various words, often nouns, to produce an adjective form. Often added to words of Latin origin, but used with other words also
3EnglishaldehydeAny of a large class of reactive organic...
4GermanAldehydaldehyde
5Latinalcoholkohl, collyrium, stibium; any other powder...
6Andalusian Arabicكُحُول
7Arabicكحلantimony; kohl, stibnite; black coloring of the...
8Arabicكُحْلantimony; kohl, stibnite
9Akkadianguḫlumkohl, antimony paste

via English psycho

StepLanguageWordMeaning
1EnglishpsychoPsychotic, or otherwise insane; A person who is...
2EnglishpsychologyThe study of the human mind; The study of human...
3Frenchpsychologiepsychology
4Latinpsychologia
5Latin-logia-logy; the study of
6Ancient Greek-λογίαBase for nouns denoting the study of something,...
7Ancient GreekλόγοςThat which is said: word, sentence, speech,...
8Ancient GreekλέγωI put in order, arrange, gather; I choose, count,...
9Proto-Indo-Europeanleǵ-to gather, collect, with derivatives meaning to...
Every word from Akkadian guḫlumEvery word from English -álEvery word from Arabic كُحْل