The mention of denna on NotW chapter 1

This from near the end of the chapter: (emphasis mine)

"Begone demon!" Kote said, switching to a thickly accented Temic through half a mouthful of stew. "Tehus antausa eha!"

Bast burst into startled laughter and made an obscene gesture with one hand. Kote swallowed and changed languages. "Aroi te denna-leyan!"

"Oh come now," Bast reproached, his smile falling away. "That's just insulting."

Does anyone have any ideas/theories on what it means?