Source : Webster's Revised Unabridged Dictionary (1913)

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.

Ell \Ell\, n. (Arch.)
   See {L}.

Source : WordNet®

ell
     n : an extension at the end and at right angles to the main
         building