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unleaded

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

First recorded in 1605–15; un-1 + lead2 + -ed3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for unleaded

unleaded

adjective
  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
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noun
  1. petrol containing a reduced amount of tetraethyl lead
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unleaded

adj.

1610s, from un- (1) "not" + leaded (see lead (n.)). In reference to gasoline, from 1965.

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Online Etymology Dictionary, © 2010 Douglas Harper