Dactylology n. : The art of communicating ideas by certain movements and positions of the fingers; -- a method of conversing practiced by the deaf and dumb.

Example:
What is the term for using only fingerspelling to communicate?

Taxonomy
dactylology, Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, glossary, english, language, ESL, dac, ty, gy, dak, lä, Unabridged Dictionary, Search Boxes, Open Dictionary.

Defination from the web:
dactylology from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Home. Visit Our Sites. Unabridged Dictionary. Learner's Dictionary. Word Central for Kids. Premium Services. Unabridged Dictionary ...