Capellan language
The Capellan language was the spoken language of the Capellans of Capella IV. 

Given names on Capella IV contained double vowels, with both vowels being pronounced when spoken, such as: Akaar, Deem, Duur, Eleen, Keel and Maab. ()

Words and phrases
Chur-ah – Expression of disappointment. Duur used this term after discovering Kirk had refused to take the fruit from Duur's female relative, as a form of Capellan challenge.

Kleegat – A deadly warrior's weapon.

Teer – Title held by the leader of the Ten Tribes; comparable to .
Languages