तत्पुरुष

Etymology
From, a classic example of such a compound where "that" is being used to mean "that person's".

Noun

 * 1) the original or supreme spirit (one of the 5 forms of ईश्वर)
 * 2)  a class of compounds (formed like the word तत्-पुरुष, ‘his servant’) in which the last member is qualified by the first without losing (as the last member of बहु-व्रीहि compounds) its grammatical independence (whether as noun or adj. or p.)
 * 3) two subdivisions of these compounds are called कर्म-धारय and द्वि-गु (qq.vv.)