请输入您要查询的英文单词:

 

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
随便看

 

英语词典包含1132095条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。

 

Copyright © 2004-2022 Newdu.com All Rights Reserved
更新时间:2025/3/21 11:33:26