1. 
   Duad
   Du'ad noun [ See Dyad .] A union of two; duality. [ R.] Harris.
   Found op http://www.encyclo.co.uk/webster/D/127
   
   
2. 
   Duad
   • (n.) A union of two; duality.
   Found op http://thinkexist.com/dictionary/meaning/duad/
   
   
3. 
   duad
   1) 2 2) A couple 3) A union of two 4) Brace 5) Couple 6) Couplet 7) Deuce 8) Distich 9) Duet 10) Duo 11) Dyad 12) Group of two 13) Ii 14) Pair 15) Span 16) Twain 17) Two 18) ...
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/duad/1
   
   

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