region, in the region between heaven and earth, an epithet
of the horses of Indra; (this would seem the natural inter-
pretation of this word in Sāmav. 1. 341. = I. 4. 1. 5. 10.; Sā-
yaṇa renders it however ‘driving on account of water’,
i. e. ‘precipitating the waters’: apsu nimittabhūtāsu ye vahanti
te'psuvāhaḥ . udakasya pātayitāraḥ . tān &c.; comp. the
explanation of apsujit). E. apsu (loc. plur. of ap) and
vāh (vah, kṛt aff. ṇvi).