unleaded

[uhn-led-id]
adjective
1.
(of gasoline) containing no tetraethyllead; lead-free.
2.
Printing. not separated or spaced with leads, as lines of type or printed matter.
noun
3.
an unleaded product, especially gasoline that contains no tetraethyllead.

Origin:
1605–15; un-1 + lead2 + -ed3

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World English Dictionary
unleaded (ʌnˈlɛdɪd)
 
adj
1.  (of petrol) containing a reduced amount of tetraethyl lead, in order to reduce environmental pollution
2.  not covered or weighted with lead
3.  printing (of lines of type, etc) not spaced or separated with leads; solid
 
n
4.  petrol containing a reduced amount of tetraethyl lead

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

unleaded
1611, from un- (1) "not" + leaded (see lead (n.)). In ref. to gasoline, from 1965.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It is also used as an additive in unleaded gasoline.
Several countries have raised petrol taxes, and now tax leaded petrol far more
  heavily than unleaded fuel.
If hydrogen is introduced in phases, as unleaded petrol was, the industry
  should be able to cope.
Most cars today run perfectly well on regular unleaded gas.
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