'Topmost' definitions:

Definition of 'topmost'

From: WordNet
adjective
At or nearest to the top; "the uppermost book in the pile"; "on the topmost step" [syn: topmost, uppermost, upmost]

Definition of 'Topmost'

From: GCIDE
  • 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]