Noun
yidam (plural yidams)
(Tibetan Buddhism) A type of deity associated with tantric or Vajrayana Buddhism said to be manifestations of Buddhahood or enlightened mind.
One practices oneself in the identification with the meditational Buddha or deity ( yidam ) by visualisations, until one can meditate single-pointedly on 'being' the deity. Source: Internet
Mandalas are sacred enclosures, sacred architecture that house and contain the uncontainable essence of a yidam. Source: Internet
The guru therefore appears with the yidam and dakini in the Three Roots refuge formulation of the three factors essential for tantric attainments. Source: Internet