The roots in īv — namely, dīv, sīv, srīv or çrīv, and ṣṭhīv (from which no forms of this class are quotable) — are written by the grammarians with iv, and a similar lengthening in the present-system is prescribed for them.

a. They appear to be properly dīū etc., since their vocalized final in other forms is always ū; dīv is by this proved to have nothing to do with the assumed root div shine, which changes todyu (361 d): compare 240 b.