Where does “psychoactivity” come from?

psychoactivity (English) comes from English psychoactive, from English active, from Middle English actyf, from Old French actif, from Latin āctīvus, from Ancient Greek ἐνεργητικός, from Ancient Greek ἐνεργέω, from Ancient Greek ἐνεργός — Creates collective nouns, which refer to groups...

psychoactivity (English): the ability for a substance to be psychoactive

Definitions

the ability for a substance to be psychoactive

Ancestry of “psychoactivity”, step by step

psychoactivity traces back through two separate lines of ancestry.

via English psychoactive

Step	Language	Word	Meaning
1	English	psychoactive	Affecting the mind or mental processes; Any drug...
2	English	active	Having the power or quality of acting; causing...
3	Middle English	actyf	active, reactive
4	Old French	actif	active
5	Latin	āctīvus	active
6	Ancient Greek	ἐνεργητικός	Able to act on; acting on; Active; In the active...
7	Ancient Greek	ἐνεργέω	to be in action or activity, to operate; to...
8	Ancient Greek	ἐνεργός	at work, active
9	Ancient Greek	ἐν-	in, within; on
10	Ancient Greek	ἐν	in, on, at; among; in, at, or during the time of
11	Ancient Greek	δέρμα	skin, hide
12	Ancient Greek	γλυφή	carving, carved work; hole cut
13	Ancient Greek	-ῐ́ᾱ	{{l\|en\|-ia}}; "suffix forming abstract feminine...
14	Proto-Indo-European	-íh₂	—
15	Proto-Indo-European	-h₂	Creates collective nouns, which refer to groups...

via English ity

Step	Language	Word	Meaning
1	English	ity	—
2	Ingrian	-u	Used to form nouns from verbs

Every word from Proto-Indo-European -h₂ →Every word from Ancient Greek -ῐ́ᾱ →Every word from Ancient Greek ἐν- →