a mine
胺 is a rare kanji whose given meaning is "a mine." Its standalone meaning is unclear and may be limited to a specific technical or historical context.
胺 combines ⺼ (flesh) with 安, which likely provides the sound. The historical origin of the meaning "a mine" is uncertain.
The left side ⺼ suggests something bodily or organic, while 安 (peace) on the right might hint at a hidden resource. Picture a peaceful-looking hillside that is secretly a mine.
For アツ, imagine a miner shouting "ats!" when he strikes a rich vein: ats -> アツ, and the mine yields its treasure.