Dac`tyl*ol"o*gy (?), n. [Gr. da`ktylos finger + -logy.] The art of communicating ideas by certain movements and positions of the fingers; -- a method of conversing practiced by the deaf and dumb.

&fist; 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.

• the use of the fingers and hands to communicate ideas, especially by the deaf