DACTYLOLOGY
Noun
dactylology (uncountable)
The use of the fingers and hands to communicate ideas, especially by the deaf.
Synonyms
• fingerspelling
• maniloquism
• cheirology
Source: Wiktionary
Dac`tyl*o"logy, n. Etym: [Gr. finger + -logy.]
Definition: 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 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.
Source: Webster’s Unabridged Dictionary 1913 Edition