or bit·ter root
Examples from the Web for bitterroot
Bitterroot was dug on prairie hills, wild potatoes were found in the foothills, and the wild onion grew in the valley floors.Shoshone-Bannock Subsistence and Society|Robert F. Murphy
I have examined a number of mice from the Bitterroot Valley in western Montana and the color value for 12 adults is 2.7.
The average of all the specimens from the Bitterroot Valley is a little nearer oribasus.American Weasels|E. Raymond Hall
This took place in the Bitterroot Mountains in Idaho, in 1902.Wild Animals at Home|Ernest Thompson Seton