"arbor, porch," 1869, in the U.S. West, from American Spanish ramada "tent, shelter," from Spanish ramada "an arbor," from rama "branch," from Vulgar Latin *rama, collective of Latin ramus "branch" (from PIE root *wrād- "branch, root").
early 15c., ramifien, "to branch out, form branches," from Old French ramifier (early 14c.), from Medieval Latin ramificari, ramificare "to form branches," from Latin ramus "branch" (from PIE root *wrād- "branch, root") + combining form of facere "to make" (from PIE root *dhe- "to set, put"). Related: Ramified; ramifying.
in anatomy, "a branch or branching part," 1803, from Latin ramus "a branch, bough, twig," from earlier *radmo- and cognate with radix "root," from PIE root *wrād- "branch, root." This is the old reconstruction, which de Vaan, after some hesitation, finds justified. Related: Ramulous; ramulose.
"branch of technology concerned with microcircuits," by 1958, from micro- + electronics.
1670s, in botany, "rootlet, part of the embryo of a plant which develops into the primary root," from Latin radicula, diminutive of radix "root" (from PIE root *wrād- "branch, root"). Anatomical sense of "branch of a nerve, vein, etc. resembling a root" is by 1830.
