The Collaborative International Dictionary of English v.0.48:

Kilo \Ki"lo\, n.; pl. Kilos. [F.]
   An abbreviation of Kilogram.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Kilo- \Kil"o-\pref. [F. kilo-. See Kilogram.]
   A combining form used to signify thousand in forming the
   names of units of measurement; as, kilogram, kilometer,
   kilowatt, etc.
   [Webster 1913 Suppl.] Kilogram

WordNet (r) 3.0 (2006):

kilo
    n 1: one thousand grams; the basic unit of mass adopted under
         the Systeme International d'Unites; "a kilogram is
         approximately 2.2 pounds" [syn: kilogram, kg, kilo]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "kilo":
   G, M, carat, centigram, chiliad, chiliagon, chiliahedron,
   chiliarch, chiliarchia, decagram, decigram, dram, dram avoirdupois,
   dyne, force, grain, gram, grand, hundredweight, kilocycle,
   kilogram, kilohertz, kiloliter, kilometer, lakh, mass, megaton,
   millennium, millepede, milligram, milliliter, mole, myriad,
   one hundred thousand, ounce, ounce avoirdupois, ounce troy,
   pennyweight, pound, pound avoirdupois, pound troy, poundal,
   scruple, slug, stone, ten thousand, thou, thousand, ton,
   units of weight, weight, yard