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Cooper: Thesaurus Linguae Romanae et Brittanicae
Abacus, abaci. pen. breui. m.g geniti. Græco a)/bacIt is a plaine place made in a building of stone to sit on, a seate or benche of marble. Plin. Also a square table of slant set vpon the thapiters of pillars in building, Vitruuius. Also a counting table, such as Auditours or Arithmetricians doe vse, or, Astronomers descriue their figures in Martian. A chest bourd, or playing tables.Macrob.A cupbourde to set plate vpon. Iuuen.Totos dies abaco & latrunculis conterunt.They spende whole dayes in playing at tables or chestes.Abacus solis.The breadth or compasse of the bodie of the sunne as it appeareth to our sight. Cælius.