Unleadeds

Part of speech: noun

Definitions

1. Pertaining to or describing fuels that do not contain tetraethyllead additives ; referring to types of gasoline formulated without lead compounds to reduce pollution and engine damage ; relating to petrol designed to be free of lead to promote environmental and health safety
2. Connected with gasoline formulations that omit lead substances ; indicating motor fuels engineered to exclude tetraethyllead for cleaner combustion ; describing petrol products made without lead to protect engines and decrease toxic emissions
3. Involving fuel varieties that are formulated without lead-based additives ; designating unleaded petrol as a cleaner alternative to leaded fuel ; characterizing motor fuel types lacking harmful lead compounds for safer usage and reduced environmental impact

Etymology: "Unleadeds" is simply the plural of "unleaded", the noun for petrol or gasoline that contains no lead additive. Its history lies in the word it is built on: "leaded" is the past participle of "lead", and "un-" is the familiar English prefix meaning "not", so the adjective "unleaded" names fuel without lead, and the plural noun is the name for grades of such fuel sold as separate products. The US standard of identity for unleaded gasoline is set out in federal regulation, 40 CFR §79.32, which defines the fuel for regulatory purposes. Because the fuel is sold in several grades, speakers naturally pluralize the noun when comparing them, as in "the unleadeds at this station are cheaper than the premium."

Synonyms: unleaded gasoline, unleaded petrol

Antonyms: leaded gasoline, leaded petrol