What's the difference between dactyliology and dactylology?

Dactyliology

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Definition:

• (n.) That branch of archaeology which has to do with gem engraving.
• (n.) That branch of archaeology which has to do with finger rings.

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Dactylology

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Definition:

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

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