tetradicadj.

/tɪˈtradɪk/

Etymology: < tetrad n. + -ic suffix. Compare French tétradique (in Cotgrave).

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).

单词	tetradic
释义	tetradicadj. /tɪˈtradɪk/ Etymology: < tetrad n. + -ic suffix. Compare French tétradique (in Cotgrave). 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). < adj.1788
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