Kilo \Ki"lo\, n.; pl. Kilos. [F.] An abbreviation of Kilogram.
Source: Webster's Revised Unabridged Dictionary (1913)
Kilo- \Kil"o-\ [F. kilo-. See Kilogram.] A combining form used to signify thousand in forming the names of units of measurement; as, kilogram, kilometer, kilowatt, etc.