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Bit·ter·root Range(bĭt′ər-ro͞ot′, -ro͝ot′)
A rugged chain of the Rocky Mountains along the Idaho-Montana border, rising to over 3,460 m (11,360 ft). The Bitterroot River rises in the central part of the range and flows about 135 km (85 mi) northward to the Clark Fork River near Missoula, Montana.
a mountain range between Idaho and Montana, a part of the Rocky Mountains: highest peak, 11,393 ft. (3473 m).