GNU Collaborative International Dictionary of English

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  1.       
    
    Dactylology , n. [Gr. δάκτυλος finger + -logy.] The art of communicating ideas by certain movements and positions of the fingers; a form of sign language, especially the manual alphabets used by the deaf and dumb.
    1913 Webster
    +PJC

    ☞ There are two different manual alphabets, the one-hand alphabet (which was perfected by Abbé de l'Epée, 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.

    1913 Webster