• 温あたたかい — warm (to the touch or emotionally)
• 温あたためる — to warm up
• 温あたたまる — to become warm
• 温泉おんせん — hot spring
• 体温たいおん — body temperature
• 気温きおん — air temperature

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The kanji 温 includes the "water" radical 氵さんずい, suggesting a connection to liquids or temperature. The phonetic part 昷オン contributes to both the reading and the idea of warmth. It’s commonly used in both physical and emotional contexts.

お湯ゆが温あたたかくなりました。
The water has warmed up.

この温泉おんせんは とても気持きもちがいいです。
This hot spring feels really nice.