In the chandas (Vedas) long ā is substituted for the final of 1. aśva and 2. agha before the Denominative kyac ,
As अश्वायन्तो मघवन् (Rig VII. 32. 23), मा त्वा वृका अघायवो विदन् ॥ This also indicates that other words do not lengthen their vowel in the Veda before क्यच्, as taught in 7.4.35. See Vartika to (III. I. 8). The word अघायु occurs in Rig I. 120.7, 27; 3.,