Abaciscus n. : One of the tiles or squares of a tessellated pavement; an abaculus.

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Taxonomy
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Defination from the web:
abaciscus from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... abaciscus. One entry found. Main Entry: abaciscus. abaciscus can be found at Merriam-WebsterUnabridged.com. Click here to start your free trial! ...