[1] : The Collaborative International Dictionary of English v.0.48

quad \quad\, quade \quade\, a. akin to as. cw=aed, cwead,
   dung, evil, g. kot, dung, ohg. qu=at.
   evil; bad; baffling; as, a quade wind. obs.
   1913 webster

         sooth play, quad play, as the fleming saith. --chaucer.
   1913 webster

[2] : The Collaborative International Dictionary of English v.0.48

quad \quad\, n. print.
   a quadrat.
   1913 webster

[3] : The Collaborative International Dictionary of English v.0.48

quad \quad\, n. arch.
   a quadrangle; hence, a prison. cant or slang
   1913 webster

[4] : WordNet (r) 2.0

quad
     n 1: one of four children born at the same time from the same
          pregnancy syn: quadruplet
     2: a muscle of the thigh that extends the leg syn: quadriceps,
         quadriceps femoris, musculus quadriceps femoris
     3: printing a block of type without a raised letter; used for
        spacing between words syn: space
     4: a rectangular area surrounded on all sides by buildings
        syn: quadrangle
see also:
quadruplet quadriceps quadriceps femoris musculus quadriceps femoris space quadrangle 

[5] : Jargon File (4.3.1, 29 Jun 2001)

quad n. 1. two bits; syn. for quarter, crumb, tayste. 2. a
   four-pack of anything compare hex, sense 2. 3. the rectangle or box
   glyph used in the apl language for various arcane purposes mostly
   related to i/o. former ivy-leaguers and oxford types are said to
   associate it with nostalgic memories of dear old university.


see also:
quarter crumb tayste hex 

[6] : The Free On-line Dictionary of Computing (27 SEP 03)

quad
     
        1. two bits; synonym for quarter, crumb, tayste.
     
        2. a four-pack of anything compare hex.
     
        3. the rectangle or box glyph used in the apl language for
        various arcane purposes mostly related to i/o.
     
        former ivy-leaguers and oxford types are said to associate it
        with nostalgic memories of dear old university short for
        "quadrangle".
     
        jargon file
     
     
see also:
quarter crumb tayste hex jargon file 

Quad- >> Q Words
Quad-, definition of term: Quad-
quad-_pag1.html