ell

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several historical units of measure, originally based on the length of the arm or forearm but later standardized at other lengths, such as the English ell of 45 inches (114 centimeters).
• noun A wing of a building at right angles to the main structure.
• noun A right-angled bend in a pipe or conduit; an elbow.

from The Century Dictionary.

• noun A long measure, chiefly used for cloth.
• noun The name of the letter L, l. It is rarely so written, the symbol being used instead.
• noun An addition to or wing of a house which gives it the shape of the capital letter L.
• noun A pipe-connection changing the direction at right angles.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Arch.) See l.
• noun 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A measure for cloth. An English ell equals 1.25 yards, whereas a Scottish ell measures only 1.0335 yards (http://www.onlineunitconversion.com). A Flemish ell measured three quarters, (27 inches).
• noun An extension usually at right angles to one end of a building.
• noun Something that is L-shaped.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an extension at the end and at right angles to the main building