n :  a yellowish essential oil with a lemony odor obtained from either of two grasses and used esp. as an insect repellent  a  :  an oil from citronella grass containing chiefly geraniol  b  :  an oil from a related grass (Cymbopogon winterianus) containing citronellal, citronellol, and geraniol .
 
 
 
Similar sounding terms:  cit·ro·nel·lal  cit·ro·nel·lol 
 
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