Thayer's Greek Lexicon

 1. to test (metals) by the touchstone, which is a black siliceous
stone used to test the purity of gold or silver by the colour
of the streak produced on it by rubbing it with either metal
2. to question by applying torture
3. to torture
4. to vex with grievous pains (of body or mind), to torment
5. to be harassed, distressed
  1) of those who at sea are struggling with a head wind