armgaunt

Perhaps arm +‎ gaunt.

armgaunt (comparative more armgaunt, superlative most armgaunt)

1. (nonce word, archaic) Of uncertain meaning; perhaps describing gaunt or slender limbs.
   • 1607, William Shakespeare, Antony and Cleopatra:

     And soberly did mount an armgaunt steed.

   • 1951, Clark Ashton Smith, The Dark Chateau: And Other Poems, page 25:

     Quixote comes, in battered mail, Armgaunt, with eyes of some keen haggard hawk Far from his eyrie

   • 1979, William Joseph Myles Starkie, The Acharnians of Aristophanes, page 195:

     SERVANT (Imitating the style of his master) The awful armgaunt knight who wields the Gorgon, shaking three shadowy plumes.

• “armgaunt”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.