top ‧ most /ˈtɒpməʊst $ ˈtɑːpmoʊst/ BrE AmE adjective [only before noun]
[ Word Family: adjective : ↑ top , ↑ topless , ↑ topmost ; noun : ↑ top , ↑ topping ; verb : ↑ top ; adverb : ↑ tops ]
the topmost part of something is its highest part SYN top :
The topmost branches were still bathed in sunlight.