The second amethyst meaning is protection, most notably protection from addiction. Even the name amethyst refers to this as you can find below under myths and legends.
The last meaning of amethyst is spiritual. Amethyst stones symbolize chastity, piety and trust. Amethyst became the gemstone of the Catholic Church and even today many bishops and cardinals wear it.
The healing properties of amethyst mostly deal with the blood and breathing. Amethyst cleanses the blood, which helps with substance abuse and fevers. While breathing is helped by the calming effect of this gemstone. To get the most effect out of your amethyst stone or crystal it should be placed in the sun. Direct sunlight is best, be aware however that it can soften the purple color.