Teer (tē'-îr, tēr) is the title of the ruler of the Ten Tribes of Capella IV. During Kirk's brief visit to the planet in 2267, the title was held by three people. Akaar held it when Kirk arrived, but a coup supported by the Klingon factor Kras left Maab as teer within a few hours of Kirk's arrival. Akaar's wife Eleen was very close to giving birth to Akaar's heir; Capellan law permitted the new teer to slay her in order to prevent the birth. Maab was about to do this, but Kirk interfered and, when he escaped the encampment, took Eleen with him.
Ensuing events led to a three-way confrontation between the Capellans, the Enterprise landing party, and Kras; these events left Maab dead. Akaar's heir had by then been born, and the title reverted to him, with Eleen as his regent. (TOS: "Friday's Child")