vRuddhi sandhi

vRuddhi sandhi (वृद्धि सन्धि)

     * वृद्धिरादैच् 

When the vowels अ, आ and ए, ओ they become ऐ, औ respectively.  This is one of the simpler forms of vRuddhi.  The other forms in this sandhi will be dealt as and when required.

Ex:

एक + एकम् = एकैकम्

राम + एव = रामैव

वन + ओषधिः = वनौषधिः 

रक्त + ओष्टः = रक्तौष्टः