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1610s, from fraternal + -ly (2).
early 15c., from Middle French fraternel and directly from Medieval Latin fraternalis, from Latin fraternus "brotherly" (see fraternity). The noun meaning "fraternal twin" is recorded by 1911.
fraternal fra·ter·nal (frə-tûr'nəl)adj.
Of or relating to brothers.
Of, relating to, or being a twin developed from two separately fertilized ova; dizygotic.