asthen-
combining form 
or astheno-
Etymology: Greek, from asthenēs weak, from a- a- (II) + -sthenēs (from sthenos strength); perhaps akin to Sanskrit saghnoti he takes upon himself, is a match for 
 : weak 
< asthenopia >
: weakness
< asthenology >
or astheno-
< asthenopia >
: weakness
< asthenology >