Where does “radiumtherapy” come from?

radiumtherapy (English) comes from English radium, from French radium, from French radioactif, from French actif, from Old French actif, from Latin āctīvus, from Ancient Greek ἐνεργητικός, from Ancient Greek ἐνεργέω — Creates collective nouns, which refer to groups...

radiumtherapy (English): The therapeutic use of radium

Definitions

The therapeutic use of radium

Ancestry of “radiumtherapy”, step by step

radiumtherapy traces back through two separate lines of ancestry.

via English radium

Step	Language	Word	Meaning
1	English	radium	The chemical element with an atomic number of...
2	French	radium	radium
3	French	radioactif	radioactive
4	French	actif	active; asset; top
5	Old French	actif	active
6	Latin	āctīvus	active
7	Ancient Greek	ἐνεργητικός	Able to act on; acting on; Active; In the active...
8	Ancient Greek	ἐνεργέω	to be in action or activity, to operate; to...
9	Ancient Greek	ἐνεργός	at work, active
10	Ancient Greek	ἐν-	in, within; on
11	Ancient Greek	ἐν	in, on, at; among; in, at, or during the time of
12	Ancient Greek	δέρμα	skin, hide
13	Ancient Greek	γλυφή	carving, carved work; hole cut
14	Ancient Greek	-ῐ́ᾱ	{{l\|en\|-ia}}; "suffix forming abstract feminine...
15	Proto-Indo-European	-íh₂	—
16	Proto-Indo-European	-h₂	Creates collective nouns, which refer to groups...

via English therapy

Step	Language	Word	Meaning
1	English	therapy	Attempted remediation of a health problem...
2	New Latin	therapīa	—
3	Ancient Greek	θεραπεία	a waiting on service; medical treatment
4	Ancient Greek	θεραπεύω	to wait on, attend, serve; to obey; to flatter,...
5	Ancient Greek	-εύω	Added to the stems of agent or other nouns in...
6	Ancient Greek	-εύς	Added to noun or adjective stems to form a...

Every word from Proto-Indo-European -h₂ →