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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Dactylology  \Dac`tyl*ol"o*gy\,  n.  [Gr.  da`ktylos  finger  + 
  The  art  of  communicating  ideas  by  certain  movements  and 
  positions  of  the  fingers;  --  a  method  of  conversing  practiced 
  by  the  deaf  and  dumb. 
  Note:  There  are  two  different  manual  alphabets,  the  one-hand 
  alphabet  (which  was  perfected  by  Abb['e]  de  l'Ep['e]e, 
  who  died  in  1789),  and  the  two-hand  alphabet.  The 
  latter  was  probably  based  on  the  manual  alphabet 
  published  by  George  Dalgarus  of  Aberdeen,  in  1680.  See 
  Illustration  in  Appendix.