Select the most appropriate one-word substitution for the given group of words. 

The use of the fingers and hands to communicate and convey ideas.

Dactylology

The most appropriate one-word substitution for "the use of the fingers and hands to communicate and convey ideas" is dactylology.

• Etymology is the study of the origin of words.
• Genealogy is the study of family history.
• Horticulture is the science of cultivating plants.

The word dactylology comes from the Greek words "daktylos," meaning "finger," and "logos," meaning "speech." Dactylology is a system of fingerspelling that is used by the deaf and hard of hearing to communicate with each other. It is a visual language that uses the 26 letters of the alphabet to represent the sounds of spoken language.