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English word heat comes from Proto-Germanic *haitaz (Hot.)
*haitaz (Proto-Germanic)
Hot.
*haitijaną (Proto-Germanic)
hǣtan (Old English)
heten (Middle English)
heat (English)
To arouse, to excite (sexually).. To cause an increase in temperature of an object or space; to cause something to become hot (often with "up").. To excite ardour in; to rouse to action; to excite to excess; to inflame, as the passions.. To excite or make hot by action or emotion; to make feverish.