Tejodhātu

Grammatical Analysis

Tejodhātu: [f.] fire element; element of heat; temperature. Formed by tejo (fire, heat, flame, thermal energy) + dhātu (element).

Orthodox Definition

Tejodhātu is the third of the four great physical elements (mahābhūta). It represents the abstract material principle of temperature, heat, cold, and maturation.

The commentaries note that its characteristic is heat (uṇhatta-lakkhaṇā)—which technically encompasses the entire spectrum from extreme heat to extreme cold. Its specific function is to mature, ripen, or consume other material phenomena (paripācana-rasā). It is the thermal energy that causes physical matter to age, decay, and transform.

Internally, the Buddha identified four primary manifestations of the fire element within the biological body:

1. The heat that warms the body.
2. The heat that causes the body to age and wither.
3. The feverish heat generated during illness.
4. The digestive fire that burns up, consumes, and metabolizes food and drink.

Textual References

• Sutta: Dhātuvibhaṅga Sutta (MN 140) – Explicitly defining the internal fire element primarily through the mechanism of biological digestion and bodily warmth.
• Abhidhamma: Dhammasaṅgaṇī (Classification of the tangible base).
• Commentary: Visuddhimagga (Chapter XI) – Clarifying that both physical heat and physical cold are expressions of this single thermal element.