The Collaborative International Dictionary of English v.0.48:

L \L\ ([e^]l), n.
   1. An extension at right angles to the length of a main
      building, giving to the ground plan a form resembling the
      letter L; sometimes less properly applied to a narrower,
      or lower, extension in the direction of the length of the
      main building; a wing. [Written also ell.]
      [1913 Webster]

   2. (Mech.) A short right-angled pipe fitting, used in
      connecting two pipes at right angles. [Written also
      ell.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ell \Ell\, n. [AS. eln; akin to D. el, elle, G. elle, OHG.
   elina, Icel. alin, Dan. alen, Sw. aln, Goth. alenia, L. ulna
   elbow, ell, Gr. ? elbow. Cf. Elbow, Alnage.]
   A measure for cloth; -- now rarely used. It is of different
   lengths in different countries; the English ell being 45
   inches, the Dutch or Flemish ell 27, the Scotch about 37.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ell \Ell\, n. (Arch.)
   See L.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "ell":
   L, addition, angle, annex, apex, arm, bend, bifurcation, bight,
   block, cant, chevron, coin, corner, crank, crook, crotchet,
   deflection, dogleg, elbow, extension, fork, furcation, hook,
   inflection, knee, nook, point, quoin, swerve, veer, vertex, wing,
   zag, zig, zigzag