oil burner; oil warmer
A small device that uses a candle or electricity to gently heat aromatic oils, releasing fragrance. Wasei-eigo from English 'aroma pot'.
wasei-eigo (Japanese-coined English), from aroma pot
I keep an oil burner in the living room and enjoy the scent of lavender.
Wasei-eigo from English 'aroma' and 'pot'. The term is not used in English for this device; the English equivalent is 'oil burner' or 'oil warmer'.