Warm Water in Worship
Uṣṇōdhakam (Sanskrit: uṣṇa = hot/warm + udaka = water; 'hot water') refers to warm or hot water specially prepared for use in worship. It is offered to the deity as a form of ācamana (ritual sipping of water), used in abhiṣeka (bathing the deity), and served to distinguished guests as a mark of honor and care.
Offering to Guests
In Śrī Vaiṣṇava hospitality (tatiyārādhanam), offering uṣṇōdhakam to a visiting devotee is one of the traditional acts of welcome — providing warm water for the guest to wash their feet, hands, and face after traveling. This practical act of care carries deep spiritual significance: tending to a devotee's physical comfort is tending to Bhagavān Himself.
Temple Usage
In temple worship, uṣṇōdhakam is used in several ways: as the final rinse after abhiṣeka (bathing the deity), as the water offered to the deity for ācamana between worship stages, and as the purifying liquid used in purifying vessels and implements. Its warmth is understood to represent both physical and spiritual purification.