Where does “astènic” come from?

astènic (Catalan) comes from Catalan astènia, from Ancient Greek ἀσθένεια, from Ancient Greek ἀσθενής, from Ancient Greek σθένος, from English micro-, from Ancient Greek μικρο-, from Ancient Greek μικρός, from Proto-Indo-European mēy- — soft, tender, dear.

astènic (Catalan): asthenic

Definitions

asthenic

Ancestry of “astènic”, step by step

Step	Language	Word	Meaning
1	Catalan	astènia	asthenia
2	Ancient Greek	ἀσθένεια	weakness; sickness; moral weakness, depravity
3	Ancient Greek	ἀσθενής	without strength, weak; feeble, sickly; sick, ill
4	Ancient Greek	σθένος	strength, might, power
5	English	micro-	API; Very small; One millionth
6	Ancient Greek	μικρο-	micro
7	Ancient Greek	μικρός	little, small
8	Proto-Indo-European	mēy-	soft, tender, dear

Every word from Proto-Indo-European mēy- →Every word from Ancient Greek μικρός →Every word from English micro- →