noun, plural dactylologies.
the technique of communicating by signs made with the fingers, especially in the manual alphabets used by the deaf.

1650–60; dactylo- + -logy

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World English Dictionary
dactylology (ˌdæktɪˈlɒlədʒɪ)
n , pl -gies
the method of using manual sign language, as in communicating with deaf people

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Dictionary.com's 21st Century Lexicon
Main Entry:  dactylology
Part of Speech:  n
Definition:  See cheirology
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American Heritage
Medical Dictionary

dactylology dac·ty·lol·o·gy (dāk'tə-lŏl'ə-jē)
The use of the fingers and hands to communicate and convey ideas, as in the manual alphabet used by hearing-impaired and speech-impaired people.

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