The Collaborative International Dictionary of English v.0.48:

Ester \Es"ter\, n. [A word invented by L. Gmelin, a German
   chemist.] (Chem.)
   An ethereal salt, or compound ether, consisting of an organic
   radical united with the residue of any oxygen acid, organic
   or inorganic; thus the natural fats are esters of glycerin
   and the fatty acids, oleic, etc.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ester
    n 1: formed by reaction between an acid and an alcohol with
         elimination of water

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "ester":
   animal oil, cerate, drying oil, essential oil, fat, fatty oil,
   fixed oil, glycerin, glycerin jelly, glycerogel, glycerogelatin,
   glycerol, glycerole, grease, hydrogenated fat, lipid, margarin,
   mineral oil, oil, olein, oleum, palmitin, polyunsaturated fat,
   sebum, stearin, tallow, triolein, tripalmitin, tristearin,
   unsaturated fat, vegetable oil, volatile oil



U.S. Gazetteer Places (2000):

Ester, AK -- U.S. Census Designated Place in Alaska
   Population (2000):    1680
   Housing Units (2000): 814
   Land area (2000):     64.628190 sq. miles (167.386237 sq. km)
   Water area (2000):    0.051043 sq. miles (0.132201 sq. km)
   Total area (2000):    64.679233 sq. miles (167.518438 sq. km)
   FIPS code:            23460
   Located within:       Alaska (AK), FIPS 02
   Location:             64.855700 N, 147.978434 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Ester, AK
    Ester