Nitragin
/ˈnʌɪtrədʒɪn/noun
A trademark for: a fertilizer consisting of a culture of nitrogen-fixing bacteria obtained from the root nodules of leguminous plants.
Origin
Late 19th century; earliest use found in The Contemporary Review. Apparently arbitrary alteration of either nitrate or nitrogen, probably after a German form; compare quots. 1910 and 1920, and also.