Why wine feels "hot": a nerve stimulus

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The standard

The trigeminal stimulus perception assigns "heat" to the nerve for warmth and pain, not to the taste buds. The measure is which sense reacts, not which word one chooses.

Criteria

"Heat" is a nerve stimulus, not a taste
Its main trigger in wine is alcohol
It stands for warmth and stimulus, not for spice
It strengthens with the serving temperature

Distinction

Heat ≠ acidity: acidity is a taste, "heat" a nerve stimulus from alcohol. The trigeminal stimulus perception separates what the palate senses from what the tongue tastes.