[a. F. arithmomètre, f. as prec. + Gr. -μέτρον: see -METER.] An instrument for working out arithmetical problems.
1876. in S. Kens. Sci. Catal.
1879. Thomson & Tait, Nat. Phil., I. I. § 401. Calculating Machines … up to the Arithmometer of Thomas of Colmar [in 1862].
