A considerable number of roots have in the Veda a long vowel in their reduplication.

a. Thus, of roots reduplicating with ā: kan, kḷp, gṛdh, tṛp, tṛṣ, dṛh, dhṛ, dhṛṣ, nam, mah, mṛj, mṛç, ran, radh, rabh, vañc, van, vaç, vas clothe, vāç, vṛj, vṛt, vṛdh, vṛṣ, çad prevail, sah, skambh. Some of these occur only in isolated cases; many have also forms with short vowel. Most are Vedic only; but dādhāra is common also in the Brāhmaṇa language, and is even found later. As to jāgṛ, see 1020 a.

b. Of roots reduplicating with ī: the so-called roots (676) dīdhī and dīdī, which make the perfect from the same stem with the present: thus, dīdétha, dīdā́ya; dīdhima, dīdhyus (also dīdhiyus, dīdiyus). But pīpī has pipye, pipyus, etc., with short i. In AV. occurs once jīhīḍa, and in AB. (and AA.) bībhāya.

c. Of roots reduplicating with ū: tu, jū, and çū (or çvā).