胺

Left meat-flesh radical (side-form of 肉, visually identical to 月 but a different semantic source) — the indexing radical. The radical choice reflects that amines are nitrogen compounds found in proteins and tissues. A modern chemistry coinage drawing on the body/flesh family alongside 胆 (bile) for chemical extracts.

Right 安 supplies the sound: ān → àn with tone shift, an exact rime match. The character was coined to transcribe the chemical term 'amine' (from ammonia, NH₃), with 安 chosen as the closest-sounding native syllable. Same phonetic family: 按 press, 案 case, 鞍 saddle.