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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
a mountain range between Idaho and Montana, a part of the Rocky Mountains: highest peak, 11,393 ft. (3473 m).
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.