The Collaborative International Dictionary of English v.0.48:

Milliliter \Mil"li*li`ter\, Millilitre \Mil"li*li`tre\, n. [F.
   millilitre; milli- milli- + litre. See Liter.]
   A measure of capacity in the metric system, containing the
   thousandth part of a liter. It is very nearly equal to a
   cubic centimeter, and is equal to .061025 of an English cubic
   inch, or to .033815 of an American fluid ounce.
   [1913 Webster] Millimeter

WordNet (r) 3.0 (2006):

milliliter
    n 1: a metric unit of volume equal to one thousandth of a liter
         [syn: milliliter, millilitre, mil, ml, cubic
         centimeter, cubic centimetre, cc]