beamless

beam +‎ -less

beamless (not comparable)

1. Not having a beam.
   • 2017, Yijiu Jin, Islam, page 7:

     […] a trend of beamless construction that became a norm of Islamic buildings.

2. Not emitting light.
   • 1817 December, Percy Bysshe Shelley, “The Revolt of Islam. […]”, in [Mary] Shelley, editor, The Poetical Works of Percy Bysshe Shelley. […], volume I, London: Edward Moxon […], published 1839, →OCLC, page 211:

     Then up a steep and dark and narrow stair
     We wound, until the torches’ fiery tongue
     Amid the gushing day beamless and pallid hung.

• assemble