un•lead•edPronunciation: (un-led'id), [key]
(of gasoline) containing no tetraethyllead; lead-free.
not separated or spaced with leads, as lines of type or printed matter.
an unleaded product, esp. gasoline that contains no tetraethyllead.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.