tetradicadj.
/tɪˈtradɪk/ a. Of, pertaining to, or of the nature of a tetrad.
ΘΚΠ
the world > relative properties > number > specific numbers > four > [adjective] > group of four
foursome15..
tetradic1788
quaternion1814
quad1881
1788 T. Taylor tr. Proclus Philos. & Math. Comm. (1792) I. 179 The tetradic ternary, and the triadic quaternary.
a1914 C. S. Peirce Coll. Papers (1935) VI. 222 A tetradic, pentadic, etc. relationship is of no higher nature than a triadic relationship.
1921 W. E. Johnson Logic I. 203 The number of substantival references are respectively one, two, three and four, and the corresponding adjectives or propositions may be called monadic, diadic, triadic and tetradic.
b. Chemistry. That is a tetrad; tetravalent.
ΘΚΠ
the world > matter > chemistry > valency > [adjective] > having a valency of four
tetratomic1862
quadrivalent1865
tetradic1868
tetravalent1868
the world > matter > chemistry > valency > [adjective] > of or relating to combining powers of elements > having a power of four
tetradic1868
1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 257 Potassium..forms two others [sc. oxides]..in the former of which it might be regarded as dyadic, and in the latter as tetradic.
1872 H. Watts Dict. Chem. VI. 237 Carbon, which combines with 4 atoms of hydrogen, is tetratomic, tetradic, or quadrivalent.
1877 H. Watts Fownes's Man. Chem. (ed. 12) I. 267 With silver..it [oxygen] forms the two oxides, Ag2O and Ag4O, in the latter of which it is tetradic.
c. Classical Prosody. (a) Containing four different metres or rhythms. (b) Composed of groups of systems, each of which contains four unlike systems.
ΚΠ
1891 in Cent. Dict.
This entry has not yet been fully updated (first published 1911; most recently modified version published online June 2018).
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adj.1788