Below are the entries from  Surya Kanta's  "A Grammatical Dictionary of Sanskrit (Vedic)"   for dīdivāṁs, ,dīdivi,and dīdihi.
For the entry for dīdivi, where he writes " dīdivi dī: dī-payati " is he saying that dīdivi is derived from a vedic form of a causative? 
Note also his explanation for the short i on the second syllable.

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Harry Spier


On Wed, Mar 19, 2025 at 8:20 AM Carmen Spiers via INDOLOGY <indology@list.indology.info> wrote:
The intensive would give de-dī... these adjectives are at least synchronically made from perfect stems. Anyway jāgr̥vi- is another example of an adjective of this type with a double suffix, and in Avestan it only has the -u- suffix, so Grestenberger suggests there were some -u- adjectives that were secondarily given -i- suffixes in Sanskrit. dī-di-u-i, jā-gr̥-u-i

Op wo 19 mrt 2025 om 11:54 schreef Uskokov, Aleksandar via INDOLOGY <indology@list.indology.info>:
Dear McComas,

The reduplication suggests it is an adjective of an intensive stem. Sayana’s comment suggests the same.

Best,
Aleksandar 


From: INDOLOGY <indology-bounces@list.indology.info> on behalf of Sharon Ben-Dor via INDOLOGY <indology@list.indology.info>
Sent: Wednesday, March 19, 2025 4:27:45 AM
To: indology@list.indology.info <indology@list.indology.info>
Subject: Re: [INDOLOGY] Help with dī́divim
 
Sorry, Should be "divo dve dīrghaś cābhyāsasyaḥ". Sharon


On Wednesday, March 19, 2025 at 09:38:56 AM GMT+2, Sharon Ben-Dor via INDOLOGY <indology@list.indology.info> wrote:


Dear McComas Taylor,

According to uṇādi-sūtra ‘divo dve dīrghaś cābhyāsakhyaḥ’ (Siddhāntakaumudī no. 495/Ujjvaladatta 4.55), the word dīdivi is derived from the root div (class 4) with the affix KviN. In his Bālamanoramā under this sūtra, Vāsudeva Dīkṣita quotes ṛgveda 1.1.8 “gopām ṛtasya dīdivim” and says that the word is used with meaning of ‘dyotamāna’.

Yours

Sharon


On Wednesday, March 19, 2025 at 05:23:51 AM GMT+2, McComas Taylor via INDOLOGY <indology@list.indology.info> wrote:


Dear colleagues,

I am hoping that you can help my students and me with ṚV 1.1.8.  There is a word describing Agni: dī́divim (MAcS of stem dī́divi), meaning 'shining'. We can see the root dī, which forms stems in both dīdī and dīdi. What part of speech is dī́divi and how it is formed?

Thanks in advance.

Looking forward to hearing from you,

Yours sincerely,

McComas




               

McComas Taylor, Professor of Sanskrit
CHL Deputy Director, Languages
College of Asia and Pacific, Australian National University
Secretary-General, International Assoc. of Sanskrit Studies



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Carmen Sylvia Spiers

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