westmost

[west-mohst or, esp. British, -muh st]

adjective

Origin of westmost

before 900; Middle English; replacing Middle English, Old English westmest; see west, -most

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Upon one of the westmost terraces of this Shephelah, nearly a thousand feet above the sea, lay Moresheth itself.
The Expositor's Bible: The Book of the Twelve Prophets, Vol. I
George Adam Smith
The other windows on this side (except the westmost) are rich, almost florid examples of the elaborated canopy style.
Stained Glass Tours in England
Charles Hitchcock Sherrill