[south-mohst or, esp. British, -muh st]
Origin of southmost
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for southmost
Most is sometimes added to a substantive, as, topmost, southmost.A Grammar of the English Tongue
It was necessary, if F12A was to be held by us, that the southmost stretch of F13 should be cleared of the enemy.
The ocean lay unruffled along the rocky headlands of Ireland's southmost shore.The Great Lone Land
W. F. Butler
The shorter diagonal, from northmost base of Ziscaberg to southmost of Hradschin, is perhaps a couple of miles.
Sandy went to the door and knocked, and in a little while one answered at the southmost of the windows.The Men of the Moss-Hags
S. R. Crockett
Word Origin and History for southmost
Online Etymology Dictionary, © 2010 Douglas Harper