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

Usage examples:

• Its advocates tell us that when these results shall have been made known, and the attention of the philanthropist and man of science shall have been directed to them, the days of the old system of dactylology, or communication by the aid of fingers, will be numbered. - "The Religious Life of London", J. Ewing Ritchie.
• They pressed hands at parting, firmly and briefly, not for the ordinary dactylology of lovers, but in sign of the treaty of amity. - "The Complete Project Gutenberg Works of George Meredith", George Meredith.
• It happened that the doctor, who knew everything, was well acquainted with dactylology and the latest sign language, used in the instruction of deaf mutes, and as it seemed likely that our stay in our present abode might be a prolonged one, he told me he would try to teach Mona to converse with us. - "Daybreak: A Romance of an Old World", James Cowan.