From WordNet (r) 3.0 (2006) [wn]:
lintel
n 1: horizontal beam used as a finishing piece over a door or
window [syn: header, lintel]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Lintel \Lin"tel\ (l[i^]n"t[e^]l), n. [OF. lintel, F. linteau,
LL. lintellus, for limitellus, a dim. fr. L. limes limit. See
Limit.] (Arch.)
A horizontal member spanning an opening, and carrying the
superincumbent weight by means of its strength in resisting
crosswise fracture.
[1913 Webster] Lintie
From Jargon File (4.4.4, 14 Aug 2003) [jargon]:
Lintel
n.
The emerging Linux/Intel alliance. This term began to be used in
early 1999 after it became clear that the Wintel alliance was under
increasing strain and Intel started taking stakes in Linux companies.