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superunleaded
su·per·un·lead·ed [ sper un léddəd ]


noun 
Definition:
 
higher-octane unleaded gasoline: unleaded gasoline to which aromatic hydrocarbons have been added in order to give it a higher octane rating, and thus better performance, than standard unleaded gasoline

su·per·un·lead·ed adjective
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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