- across or beyond the Mississippi River.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for trans-mississippi
The President asked what assistance might be expected from the trans-Mississippi.Destruction and Reconstruction:
The great northwest and trans-Mississippi territory was not yet opened up.Railroads: Rates and Regulations
William Z. Ripley
The Trans-Mississippi department numbered fifty thousand men.The Missourian
Eugene P. (Eugene Percy) Lyle
Mr. Memminger has sent a press to the trans-Mississippi country, to issue paper money there.
Gen. Hood also urges the reinforcing of his army from the trans-Mississippi Department.