A quick search on the phrase suggests Khajiiti is both used as the adjective and the plural form.
When Brin bought his first Bosmer slave, he ordered his castellan to whip him only for an hour. The creature, which Brin had named Dob, seemed so much more delicate than the Argonians and Khajiiti and Orcs who made up the bulk of his slaves. Dob was clearly ill suited for work in the mines or in the fields, but he seemed presentable enough for domestic service.http://www.imperial-library.info/content/morrowind-marksmanship-lesson
Musicians played in the plazas great and small, and on every street corner was a new exotic entertainer: Redguard snake charmers, Khajiiti acrobats, magicians of genuine power and those whose flamboyant skill was equally impressive if largely illusion.http://www.imperial-library.info/content/oblivion-mystery-princess-talara
"I'm meeting a former colleague there. He asked me to come down from the Imperial City where I worked for the Atrius Building Commission to negotiate some contracts," Scotti took another bite of the dried sausages they were sharing for dinner. "We're going to try to repair and refurbish whatever bridges, roads, and other structures that got damaged in the recent war with the Khajiiti."http://www.imperial-library.info/content/oblivion-dance-fire-3
Alkosh (Dragon King of Cats): Pre-ri'Datta Dynasty Anaquinine deity. A variation on the Altmeri Auri-El, and thus an Akatosh-as-culture-hero for the earliest Khajiiti. His worship was co-opted during the establishment of the Riddle-T'har, and he still enjoys immense popularity in Elsweyr's wasteland regions. He is depicted as a fearsome dragon, a creature the Khajiit say 'is just a real big cat'. He repelled an early Aldmeri pogrom of Pelinal Whitestrake during mythic times.http://www.imperial-library.info/content/morrowind-varieties-faith-empire
The finest Khajiiti swordsmith couldn't hone an edge this keen,” he said, looking at his beloved with pride. “And I know I nicked it up good last night.”http://www.imperial-library.info/content/morrowind-last-scabbard-akrash