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high-octane

adjective, (of petrol) having a high octane number

high time

adverb, the latest possible time; a time that is almost too late

histamine

noun, an amine formed from histidine and released by the body tissues in allergic reactions, causing irritation. It also stimulates gastric secretions, dilates blood vessels, and contracts smooth muscle. Formula: C₅H₉N₃. See also antihistamine