octadicadj.
/ɒkˈtadɪk/, U.S. /ɑkˈtædɪk/ rare.
Of or relating to an octad or octads. octadic surface n. Geometry a quartic surface having eight nodes which can be thought of as the intersections of three quadric surfaces.
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the world > matter > chemistry > valency > [adjective] > of or relating to combining powers of elements > having a power of eight
octadic1870
1870 Proc. London Math. Soc. 3 20 Suppose that the [quartic] surface has an 8th node:—there are two distinct cases; viz., (1) the 8 nodes are the points of intersection of 3 quadric surfaces, or say they are an octad, and the surface is said to be octadic; [etc.].
1935 Trans. Amer. Math. Soc. 37 207 Our results will be generalizations of certain results which W. L. Edge has, in connection with his study of octadic surfaces, described for the case r = 3, ρ = 2, n = 2.
1959 Jrnl. Philos. 56 27 In the first place a relation may be dyadic, triadic, octadic,..n-adic.
1991 Classical Philol. 86 230 The dochmiac becomes a ‘pentadic’ unit; Greek literature is permeated by ‘heptadic’ and ‘octadic’ aeolic, and so on. Herodotus would have cringed.
This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022).
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