asthen(o)-衰弱,无力(a-+<希>sthenos 力)
1) asthenia (asthen- +-ia) n. 衰弱,无力
2) asthenopia (asthen-+-opia) n. 眼疲劳,视力疲劳,视力衰弱
3) myasthenia (my- + asthen- + -ia) n. 肌无力,肌肉衰弱