What is "abaciscus"

Abaciscus \Ab`a*cis"cus\ ([a^]b`[.a]*s[i^]s"k[u^]s), n. [Gr. 'abaki`skos, dim of 'a`bax. See Abacus.] (Arch.) One of the tiles or squares of a tessellated pavement; an abaculus.

n. (context archaic English) One of the tiles or squares of a tessellated pavement; an abaculus. (First attested in the mid 18^th century.)(R:SOED5: page=2)

Abaciscus is a genus of moth in the family Geometridae.