Citronella (noun)

An essential oil obtained from the leaves and stems of various species of lemongrass, used as a insect repellent and in perfumes and soaps.

Origin:

Mid 19th century: from italian citronella, diminutive of citrone "lemon", from latin citrus "citron tree".

Examples:

1. Citronella candles are used to repel mosquitoes.
2. I put some citronella oil on my skin to keep the bugs away.
3. The citronella scent was strong but pleasant.
4. Citronella is also used in some soaps and lotions.
5. The citronella plants in the garden helped to reduce the number of mosquitoes.