Dadhi-krā is the name of a divine horse or bird, personification of the morning Sun, which is addressed in the Rigveda.
He is invoked in the morning along with Agni, Ushas and the Asvins. Although the etymological origin is not certain, it has been suggested that the name is derived from dadhi meaning thickened milk and kri meaning to scatter. This scattering could attributed to the effect of the morning sun on dew or hoar frost.
References
Dadhikra Wikipedia(Text) CC BY-SA