Than'tha

A than'tha is the Vulcan adult who guides guides a Vulcan child through their first mind meld, on the eve of their seventh birthday. The role of than'tha is usually carried out by the parent of the child.

In 2293, Spock was called upon by Saavik to serve as than'tha to Sanara, an orphaned Vulcan-human child. (TOS short story: "The First Law of Metaphysics")