Pronunciation: (un-led'id), [key]
1. (of gasoline) containing no tetraethyllead; lead-free.
2. Print.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.