Gatha

[gah-tuh, -tah] /ˈgɑ tə, -tɑ/
noun, Zoroastrianism.
1.
one of several groups of hymns (the Gathas) forming the oldest part of the Avesta.
Origin
< Avestan gāthā-; cognate with Sanskrit gāthā song
British Dictionary definitions for Gatha

Gatha

/ˈɡɑːtə/
noun
1.
(Zoroastrianism) any of a number of versified sermons in the Avesta that are in a more ancient dialect than the rest
Word Origin
from Avestan gāthā-; related to Sanskrit gāthā song