द्विष is the verb root. वि-is the prefix. This gives rise to the new verb root विद्विष .

द्वेष is the nominalization derived from द्विष . विद्वेष is the nominalization derived from विद्विष

This is similar to विश ,प्रविश, प्रवेश .

On Mon, Aug 15, 2016 at 3:17 AM, Harry Spier <hspier.muktabodha@gmail.com> wrote:

Dear list members,

Apologies if this is an elementary question.

In the Shanti mantra taken from the Taittiriya Upanishad

saha nāvavatu saha nau bhunaktu saha vīryaṁ karavāvahai tejasvi nāvadhītam astu mā vidviṣāvahai
Why is it vidviṣāvahai and not vidveṣāvahai similar to the form dveṣāvahai ?
I couldn't see it listed as an irregular form in MacDonnels grammar for students or his Vedic grammar for students or Whitney.

Thanks,
Harry Spier

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Nagaraj Paturi

Hyderabad, Telangana, INDIA.

Former Senior Professor of Cultural Studies

FLAME School of Communication and FLAME School of Liberal Education,

(Pune, Maharashtra, INDIA )