īrmā́nta mfn. (fr. īrma = īrita with anta, [Sāy.]), full-haunched (lit. full-ended, [RV.])
thin-haunched
(perhaps) having the biggest (or quickest?) horses on both sides of the team
N. of a team of horses or of the horses of the sun's car, [RV. i, 163, 10.]