By Swami Harshananda
Sometimes transliterated as: Samidheni, SAmidhenI, Saamidheni
sāmidhenī (‘related to samidh [or sacrificial fuel-stick]’)
When the Darśapurṇamāsa sacrifice is being performed, at a particular stage, eleven (or fifteen) mantras from the Rgveda are chanted to kindle the fire. These are known as the sāmidhenī verses.
They are: 3.27.1; 6.16.10-12; 3.27.13-15; 1.12.1; 3.27.4; 5.28.5-6.
Though these are eleven mantras, by repeating the first and the last verses
twice each, the total becomes fifteen.
All of them are addressed to the deity Agni requesting him to burn more
brilliantly and carry the offerings to the Vedic gods.
A samidh (fuel-stick) is offered into the fire after each mantra.
- The Concise Encyclopedia of Hinduism, Swami Harshananda, Ram Krishna Math, Bangalore