From Longman Dictionary of Contemporary Englishtopmosttop‧most /ˈtɒpməʊst $ ˈtɑːpmoʊst/ adjective [only before noun] TOPthe topmost part of something is its highest part SYN top The topmost branches were still bathed in sunlight.
Examples from the Corpus
topmost• At first it was just a dot in the valley below, perched on the topmost branch of a lightning-blasted conifer.• Only the topmost branches were still gilded by daylight, the illuminated areas shrinking as the sun dropped below the misty horizon.• The topmost edge of the sun was about to dip beyond the North Water.• The topmost new box is the desktop, which is basically the entire screen of the computer.• The lower props are horizontal; the topmost prop is curved to follow the line of the girder.• the topmost row of seats• Rostov scanned the platform above for Alexei and saw him finally on the topmost section of the catwalk.• Janey went to the back steps, sat on the topmost step and wept.• Above him, the topmost twigs of the trees whispered interminably. 