From Wiktionary, the free dictionary
ตสฺส
- Thai script form of tassa, which is genitive/dative singular masculine/neuter of ต (ta, “that”)
ตสฺส
- (demonstrative) Thai script form of tassa (“to him, to it, to that”), which is dative singular of ต (ta, “he, it”)
- (demonstrative) Thai script form of tassa (“his, its, of that”), which is genitive singular of ต (ta, “he, it”)