1 (also citronella oil) [mass noun] a fragrant natural oil used as an insect repellent and in perfume and soap manufacture: [as modifier]:citronella candles
2the South Asian grass from which citronella oil is obtained.
Cymbopogon nardus, family Gramineae
Origin:
mid 19th century: modern Latin, from citron + the diminutive suffix -ella
citronella in other Oxford dictionaries
Definition of citronella in the US English dictionary
