hexadn.

Brit.

/ˈhɛksad/, U.S.

/ˈhɛkˌsæd/

Etymology: < Greek ἑξάς, -αδ- a group of six, < ἕξ six.

1. The number six (in the Pythagorean System); a series of six numbers.

ΚΠ

1660 T. Stanley Hist. Philos. III. i. 62 The Pythagoreans held the number Six to be perfect... The names of the Hexad, are these.

2. A group of six.

ΚΠ

1873 G. Salmon Treat. Higher Plane Curves (ed. 2) vi. 224 The following two groups of hexads of bitangents.

1873 G. Salmon Treat. Higher Plane Curves (ed. 2) vi. 225 These 1008 and 5040 hexads have been studied by Hesse and Steiner as bitangents whose twelve points of contact lie on a proper cubic.

3. Chemistry. An element or radical that has the combining power of six units, i.e. of six atoms of hydrogen. Chiefly attributive or adj.

ΘΚΠ

the world > matter > chemistry > valency > [noun] > combining powers of elements > element with the power of six

hexad1871

1871 H. E. Roscoe Lessons Elem. Chem. (new ed.) xvii. 188 Six molecules of water in which half of the hydrogen is replaced by a hexad group.

1877 W. A. Miller's Elem. Chem. (ed. 5) i. 34 Hexads or Elements, each atom of which in combining may represent six atoms of Hydrogen.

Derivatives

heˈxadic adj. of the nature of a hexad (sense 3).

ΘΚΠ

the world > matter > chemistry > valency > [adjective] > of or relating to combining powers of elements > having a power of six

hexadic1868

1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 259 Sulphur has..lately been shown to form certain organic compounds in which it is tetradic, and others in which it appears to be hexadic.

This entry has not yet been fully updated (first published 1898; most recently modified version published online March 2022).

单词	hexad
释义	hexadn. Brit. /ˈhɛksad/, U.S. /ˈhɛkˌsæd/ Etymology: < Greek ἑξάς, -αδ- a group of six, < ἕξ six. 1. The number six (in the Pythagorean System); a series of six numbers. ΚΠ 1660 T. Stanley Hist. Philos. III. i. 62 The Pythagoreans held the number Six to be perfect... The names of the Hexad, are these. 2. A group of six. ΚΠ 1873 G. Salmon Treat. Higher Plane Curves (ed. 2) vi. 224 The following two groups of hexads of bitangents. 1873 G. Salmon Treat. Higher Plane Curves (ed. 2) vi. 225 These 1008 and 5040 hexads have been studied by Hesse and Steiner as bitangents whose twelve points of contact lie on a proper cubic. 3. Chemistry. An element or radical that has the combining power of six units, i.e. of six atoms of hydrogen. Chiefly attributive or adj. ΘΚΠ the world > matter > chemistry > valency > [noun] > combining powers of elements > element with the power of six hexad1871 1871 H. E. Roscoe Lessons Elem. Chem. (new ed.) xvii. 188 Six molecules of water in which half of the hydrogen is replaced by a hexad group. 1877 W. A. Miller's Elem. Chem. (ed. 5) i. 34 Hexads or Elements, each atom of which in combining may represent six atoms of Hydrogen. Derivatives heˈxadic adj. of the nature of a hexad (sense 3). ΘΚΠ the world > matter > chemistry > valency > [adjective] > of or relating to combining powers of elements > having a power of six hexadic1868 1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 259 Sulphur has..lately been shown to form certain organic compounds in which it is tetradic, and others in which it appears to be hexadic. This entry has not yet been fully updated (first published 1898; most recently modified version published online March 2022). < n.1660
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