Where does “metadyne” come from?

metadyne (English) comes from English -dyne, from Ancient Greek δύναμις, from Ancient Greek δύναμαι, from Proto-Hellenic *dunamai.

metadyne (English): A direct current electrical machine with two pairs of brushes, able to be used as an amplifier or rotary transformer

Definitions

A direct current electrical machine with two pairs of brushes, able to be used as an amplifier or rotary transformer

Step	Language	Word	Meaning
1	English	-dyne	Forms names of certain types of motors and electrical circuits
2	Ancient Greek	δύναμις	power, might, strength; ability, skill; power,...
3	Ancient Greek	δύναμαι	deponent; to be able, capable, strong enough to...
4	Proto-Hellenic	*dunamai	—