topmost

from WordNet (r) 3.0 (2006)

topmost
    adj 1: at or nearest to the top; "the uppermost book in the
           pile"; "on the topmost step" [syn: {topmost},
           {uppermost}, {upmost}]

from The Collaborative International Dictionary of English v.0.48

Topmost \Top"most`\, a.
   Highest; uppermost; as, the topmost cliff; the topmost branch
   of a tree.
   [1913 Webster]

         The nightngale may claim the topmost bough. --Cowper.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

49 Moby Thesaurus words for "topmost":
      acmatic, all-absorbing, apical, best, capital, cardinal, chief,
      consummate, controlling, dominant, first-class, first-rate,
      foremost, greatest, head, headmost, highest, leading, main, master,
      maximal, maximum, meridian, meridional, most, outside, overmost,
      overriding, overruling, paramount, predominant, preeminent,
      premier, primary, prime, principal, ranking, summital, superlative,
      supreme, tip-top, top, top-notch, ultimate, upmost, uppermost,
      utmost, vertical, zenithal