[syn: citrus, citrus tree]
The Collaborative International Dictionary of English v.0.48:
Citrus \Cit"rus\ (s[i^]t"r[u^]s), n. [L., a citron tree.]
   1. (Bot.) A genus of trees including the orange, lemon, lime,
      tangerine, citron, grapefruit, etc., originally natives of
      southern Asia.
      [1913 Webster]
   2. (Bot.) any tree belonging to the genus Citrus, having
      leathery evergreen leaves and bearing a soft pulpy fruit
      covered by a thick skin; -- called also citrus tree.
      [PJC]
   3. (Bot.) the fruit of a tree belonging to the genus
      Citrus, having a thick shiny skin and a soft, sweet to
      tart pulp.
      [PJC]
WordNet (r) 3.0 (2006):
citrus
    n 1: any of numerous fruits of the genus Citrus having thick
         rind and juicy pulp; grown in warm regions [syn: citrus,
         citrus fruit, citrous fruit]
    2: any of numerous tropical usually thorny evergreen trees of
       the genus Citrus having leathery evergreen leaves and widely
       cultivated for their juicy edible fruits having leathery
       aromatic rinds [syn: citrus, citrus tree]
U.S. Gazetteer Counties (2000):
Citrus -- U.S. County in Florida
   Population (2000):    118085
   Housing Units (2000): 62204
   Land area (2000):     583.810635 sq. miles (1512.062538 sq. km)
   Water area (2000):    189.337907 sq. miles (490.382908 sq. km)
   Total area (2000):    773.148542 sq. miles (2002.445446 sq. km)
   Located within:       Florida (FL), FIPS 12
   Location:             28.894637 N, 82.469163 W
   Headwords:
    Citrus
    Citrus, FL
    Citrus County
    Citrus County, FL
U.S. Gazetteer Places (2000):
Citrus, CA -- U.S. Census Designated Place in California
   Population (2000):    10581
   Housing Units (2000): 2659
   Land area (2000):     0.897850 sq. miles (2.325420 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.897850 sq. miles (2.325420 sq. km)
   FIPS code:            13560
   Located within:       California (CA), FIPS 06
   Location:             34.114891 N, 117.891786 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Citrus, CA
    Citrus