noun
mint oil; peppermint oil
Refers to essential oil extracted from mint plants, especially peppermint. Used in aromatherapy, cosmetics, and as a flavoring.
アロマテラピーでハッカ油を使うと、気分がすっきりします。
Using peppermint oil in aromatherapy makes you feel refreshed.
この歯磨き粉には天然の薄荷油が配合されています。
This toothpaste contains natural mint oil.
薄荷 refers to the mint plant itself, while 薄荷油 specifically means the oil extracted from it.
Compound of 薄荷 (はっか, 'mint') and 油 (ゆ, 'oil'). The word 薄荷 is a Sino-Japanese term for mint.