dyadn.

Brit.

/ˈdʌɪad/, U.S.

/ˈdaɪˌæd/

Forms: Also 1600s diad.

Etymology: < Latin dyas, dyad-, < Greek δυάς, δυάδ-, the number two.

1. The number two; a group of two; a couple. Cf. duad n. 1.

ΘΚΠ

the world > relative properties > number > specific numbers > two > pair > [noun]

pairc1300

couple1365

paira1382

gemels1382

pair1391

yokea1425

brace1430

binarya1464

match1542

twin1569

binity?1578

twoa1585

couplement1596

Gemini1602

couplet1604

twain1607

duad1660

dyad1675

duet1749

tway?a1800

doublet1816

two-group1901

two-grouping1901

coupling1961

1675 R. Burthogge Cavsa Dei 244 Now a Monad and a Diad, or One and Two, makes Three.

1678 R. Cudworth True Intellect. Syst. Universe i. iv. 372 The Writer..doth affirm, Pythagoras to have asserted Two Substantial Principles Self-existent, a Monad and a Dyad.

1809 W. Irving Hist. N.Y. I. i. i. 11 Pythagoras likewise inculcated the famous numerical system of the monad, dyad and triad.

1885 F. Hall in Ballantyne's Sánkhya Aphorisms 224 The gross product of Nature, viz., the great elements and the dyad of bodies.

2. In specific uses:

a. Chemistry. An atom, radical, or element that has the combining power of two units, i.e. of two atoms of hydrogen.

ΘΚΠ

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

dyad1865

1865 Reader 1 Apr. 372/2 Each of these atoms combines usually with three monads, or with one dyad and one monad.

1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 259 Sulphur, selenium, and tellurium, are usually regarded as dyads.

b. Biology. A secondary unit of organization consisting of an aggregate of monads. Hence dyaddeme.

ΚΠ

1883 P. Geddes in Encycl. Brit. XVI. 843/2 Starting from the unit of the first order, the plastid or monad, and terming any undifferentiated aggregate a deme, we have a monad-deme integrating into a secondary unit or dyad, this rising through dyad-demes into a triad, these forming triad-demes, etc.

c. Prosody. A group of two lines having different rhythms.

ΘΚΠ

society > leisure > the arts > literature > poetry > part of poem > [noun] > stanza > couplet > two lines with different rhythms

dyad1885

1885 B. L. Gildersleeve Pindar p. liii Dyads and triads there are in Pindar, but they do not disturb the rhythmical working of the odes.

d. Mathematics. An operator ab so defined that F. (ab) = (F.a)b for all F, where a and b are vectors and F is any linear vector function.

ΚΠ

1884 J. W. Gibbs Coll. Wks. (1928) II. ii. iii. 53 An expression of the form αλ or βμ will be called a dyad.

1933 H. B. Phillips Vector Anal. x. 217 A linear equation satisfied by dyads will remain valid if each dyad is replaced by the dot or cross product of its two vectors.

1969 Ll. G. Chambers Course Vector Anal. vi. 181 Consider now the dyad, or indefinite product of two vectors a and b, ab... This has the properties that (ab). F = a(b. F) and F. (ab) = (F. a)b.

Compounds

C1. attributive or as adj. = dyadic adj. and n.

ΘΚΠ

the world > relative properties > number > specific numbers > two > pair > [adjective]

double1393

coupledc1440

conjugate1471

duplicate?a1475

jumellec1475

gemel1497

geminate1589

paired1595

fellowed1654

duplicatory1659

gemellous1697

dyadic1728

duplex1817

Siamese twins1829

parial1849

dyad1869

duadic1879

pairwise1913

duplicitous1985

1869 H. E. Roscoe Lessons Elem. Chem. (new ed.) xxv. 248 Copper is a dyad element.

1881 Athenæum 26 Mar. 433/1 He has also prepared the hydrate and oxalate of the dyad radical (C₂H₂Hg₃O₂).

C2.

dyad axis Crystallography an axis of binary symmetry.

ΚΠ

1909 Cent. Dict. Suppl. Dyad axis.

Draft additions 1997

Anatomy. A structure found in vertebrate cardiac muscle and some insect muscle, consisting of a transverse tubule in contact with a terminal cisterna of the sarcoplasmic reticulum.

ΘΚΠ

the world > life > the body > structural parts > muscle > parts of muscle > [noun]

wella1400

fontanelle?a1425

head?a1425

belly1591

venter1615

tail1719

myotome1857

sclerotome1857

myomere1868

muscle spindle1894

spindle1894

Z line1916

Z band1950

dyad1957

triad1957

1957 Porter & Palade in Jrnl. Biophysical & Biochem. Cytol. 3 286 Within the area enclosed by the arms of the U there may be an additional circular or oval profile which in some instances is continuous with the inner surface of the U-shaped element... This unit of two components will be referred to as a dyad.

1964 Jrnl. Cell Biol. 22 694/1 In cardiac muscle and in certain insect muscles the homologue of the triad is to be found in the dyad.

1984 J. F. Lamb et al. Essent. Physiol. (ed. 2) iii. 59 The T system opens to the extracellular space and is related to the SR [sc. sarcoplasmic reticulum] via a series of flattened membranous sacs (dyads).

This entry has not yet been fully updated (first published 1897; most recently modified version published online March 2022).

单词	dyad
释义	dyadn. Brit. /ˈdʌɪad/, U.S. /ˈdaɪˌæd/ Forms: Also 1600s diad. Etymology: < Latin dyas, dyad-, < Greek δυάς, δυάδ-, the number two. 1. The number two; a group of two; a couple. Cf. duad n. 1. ΘΚΠ the world > relative properties > number > specific numbers > two > pair > [noun] pairc1300 couple1365 paira1382 gemels1382 pair1391 yokea1425 brace1430 binarya1464 match1542 twin1569 binity?1578 twoa1585 couplement1596 Gemini1602 couplet1604 twain1607 duad1660 dyad1675 duet1749 tway?a1800 doublet1816 two-group1901 two-grouping1901 coupling1961 1675 R. Burthogge Cavsa Dei 244 Now a Monad and a Diad, or One and Two, makes Three. 1678 R. Cudworth True Intellect. Syst. Universe i. iv. 372 The Writer..doth affirm, Pythagoras to have asserted Two Substantial Principles Self-existent, a Monad and a Dyad. 1809 W. Irving Hist. N.Y. I. i. i. 11 Pythagoras likewise inculcated the famous numerical system of the monad, dyad and triad. 1885 F. Hall in Ballantyne's Sánkhya Aphorisms 224 The gross product of Nature, viz., the great elements and the dyad of bodies. 2. In specific uses: a. Chemistry. An atom, radical, or element that has the combining power of two units, i.e. of two atoms of hydrogen. ΘΚΠ the world > matter > chemistry > valency > [noun] > combining powers of elements > element with the power of two dyad1865 1865 Reader 1 Apr. 372/2 Each of these atoms combines usually with three monads, or with one dyad and one monad. 1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 259 Sulphur, selenium, and tellurium, are usually regarded as dyads. b. Biology. A secondary unit of organization consisting of an aggregate of monads. Hence dyaddeme. ΚΠ 1883 P. Geddes in Encycl. Brit. XVI. 843/2 Starting from the unit of the first order, the plastid or monad, and terming any undifferentiated aggregate a deme, we have a monad-deme integrating into a secondary unit or dyad, this rising through dyad-demes into a triad, these forming triad-demes, etc. c. Prosody. A group of two lines having different rhythms. ΘΚΠ society > leisure > the arts > literature > poetry > part of poem > [noun] > stanza > couplet > two lines with different rhythms dyad1885 1885 B. L. Gildersleeve Pindar p. liii Dyads and triads there are in Pindar, but they do not disturb the rhythmical working of the odes. d. Mathematics. An operator ab so defined that F. (ab) = (F.a)b for all F, where a and b are vectors and F is any linear vector function. ΚΠ 1884 J. W. Gibbs Coll. Wks. (1928) II. ii. iii. 53 An expression of the form αλ or βμ will be called a dyad. 1933 H. B. Phillips Vector Anal. x. 217 A linear equation satisfied by dyads will remain valid if each dyad is replaced by the dot or cross product of its two vectors. 1969 Ll. G. Chambers Course Vector Anal. vi. 181 Consider now the dyad, or indefinite product of two vectors a and b, ab... This has the properties that (ab). F = a(b. F) and F. (ab) = (F. a)b. Compounds C1. attributive or as adj. = dyadic adj. and n. ΘΚΠ the world > relative properties > number > specific numbers > two > pair > [adjective] double1393 coupledc1440 conjugate1471 duplicate?a1475 jumellec1475 gemel1497 geminate1589 paired1595 fellowed1654 duplicatory1659 gemellous1697 dyadic1728 duplex1817 Siamese twins1829 parial1849 dyad1869 duadic1879 pairwise1913 duplicitous1985 1869 H. E. Roscoe Lessons Elem. Chem. (new ed.) xxv. 248 Copper is a dyad element. 1881 Athenæum 26 Mar. 433/1 He has also prepared the hydrate and oxalate of the dyad radical (C₂H₂Hg₃O₂). C2. dyad axis Crystallography an axis of binary symmetry. ΚΠ 1909 Cent. Dict. Suppl. Dyad axis. Draft additions 1997 Anatomy. A structure found in vertebrate cardiac muscle and some insect muscle, consisting of a transverse tubule in contact with a terminal cisterna of the sarcoplasmic reticulum. ΘΚΠ the world > life > the body > structural parts > muscle > parts of muscle > [noun] wella1400 fontanelle?a1425 head?a1425 belly1591 venter1615 tail1719 myotome1857 sclerotome1857 myomere1868 muscle spindle1894 spindle1894 Z line1916 Z band1950 dyad1957 triad1957 1957 Porter & Palade in Jrnl. Biophysical & Biochem. Cytol. 3 286 Within the area enclosed by the arms of the U there may be an additional circular or oval profile which in some instances is continuous with the inner surface of the U-shaped element... This unit of two components will be referred to as a dyad. 1964 Jrnl. Cell Biol. 22 694/1 In cardiac muscle and in certain insect muscles the homologue of the triad is to be found in the dyad. 1984 J. F. Lamb et al. Essent. Physiol. (ed. 2) iii. 59 The T system opens to the extracellular space and is related to the SR [sc. sarcoplasmic reticulum] via a series of flattened membranous sacs (dyads). This entry has not yet been fully updated (first published 1897; most recently modified version published online March 2022). < n.1675
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