[1875–80; dextro- + rotatory]This word is first recorded in the period 1875–80. Other words that entered Englishat around the same time include: cross-fertilization, graph, knockabout, slime mold, weekenddextro- is a combining form meaning “right,” used in the formation of compound words. Otherwords that use the affix dextro- include: dextroamphetamine, dextroglucose, dextrosinistral