Troth is from the same Middle-English root as the word "truth." It is related to the ancient Inod-European root deru, meaning firm or solid, and from which the word "Druid" is derived.

In the Norse Heathen or Asatru faith, trith means to be true or faithful to the gods and one's kin, and often refers to an Asatru group, usually made up of smaller "kindreds." It also refers to an oath or covenant of membership.

You can read more about the Asatru faith here: Asatru

Pronunciation: oss-ott-true • (noun)

Related Resources:

• Asatru
  The customs, history, and links on Norse Spirituality on About.com.
• Asatru symbols
  Emblems of Norse religion illustrated and explained.
• Runes- The Alphabet of Odin
  Discover the ancient oracular alphabet of the Norse, the meanings of the Runic characters, and learn how to do a basic divination with Runes.