cit·ro·nel·la   Pronunciation Key  (str-nl)
n.
  1. A tropical Asian grass (Cymbopogon nardus) having bluish-green, lemon-scented leaves and an essential oil.
  2. A pale yellow to brownish aromatic oil obtained from this plant, used chiefly in perfumery and also in some insect repellents and commercial flavorings.
[New Latin, from French citronnelle, lemon oil, diminutive of citron, citron. See citron.]
 
Source: The American Heritage® Dictionary of the English Language, Fourth Edition
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