The Collaborative International Dictionary of English v.0.48:

Hectoliter \Hec"to*li`ter\, Hectolitre \Hec"to*li`tre\, n. [F.
   hectolitre, fr. Gr. ? hundred + F. litre a liter.]
   A measure of liquids, containing a hundred liters; equal to a
   tenth of a cubic meter, nearly 261/2 gallons of wine measure,
   or 22.0097 imperial gallons. As a dry measure, it contains
   ten decaliters, or about 25/6 Winchester bushels. Hectometer

WordNet (r) 3.0 (2006):

hectolitre
    n 1: a metric unit of volume or capacity equal to 100 liters
         [syn: hectoliter, hectolitre, hl]