155. In a few roots

 In a few roots, when a final sonant aspirate (घ् gh, ध् dh, भ् bh; also ह् h, as representing an original घ् gh) thus loses its aspiration, the initial sonant consonant (ग् g or द् d or ब् b) becomes aspirate.

a. That is to say, the original initial aspirate of such roots is restored, when its presence does not interfere with the euphonic law, of comparatively recent origin, which (in Sanskrit and Greek) forbids a root to both begin and end with an aspirate.

b. The roots which allow this peculiar change are:

in gh—dagh;

in h (for original gh)—dah, dih, duh, druh, dṛṅh, guh; and also grah (in the later desiderative jighṛkṣa);

in dh—bandh, bādh, budh;

in bh—dabh (but only in the later desiderative dhipsa, for which the older language has dipsa).

c. The same change appears when the law as to finals causes the loss of the aspiration at the end of the root: see above, 141.

d. But from dah, duh, druh, and guh are found in the Veda also forms without the restored initial aspirate: thus, dakṣat; adukṣat; dudukṣa etc.; jugukṣa; mitradrúk.

e. The same analogy is followed by dadh, the abbreviated substitute of the present-stems dadhā, from √dhā (667), in some of the forms of conjugation: thus, dhatthas from dadh + thas, adhatta from adadh + ta, adhaddhvam from adadh + dhvam, etc.

f. No case is met with of the throwing back of an aspiration upon combination with the 2d sing. impv. act. ending dhi: thus, dugdhi, daddhi (RV.), but dhugdhvam, dhaddhvam.