dichotomousadj.

Brit.

/dʌɪˈkɒtəməs/,

/dᵻˈkɒtəməs/, U.S.

/daɪˈkɑdəməs/

Origin: A borrowing from Latin, combined with an English element. Etymons: Latin dichotomos , -ous suffix.

Etymology: < post-classical Latin dichotomos, dichotomus halved (4th cent.), (in botany) dividing into two equal branches (1696 in Ray, or earlier; < ancient Greek διχότομος cut in half, equally divided, especially with reference to a half moon < διχο- dicho- comb. form + -τομος : see -tome comb. form) + -ous suffix. Compare dichotomized adj.

†1. Astronomy. = dichotomized adj. 2. Obsolete.

ΘΚΠ

the world > the universe > planet > primary planet > moon > phase > [adjective] > half-illuminated

dichotomized1675

dichotomous1675

divided1822

1675 E. Sherburne in tr. M. Manilius Sphere App. 180 In [Mercury's]..greatest Digression from the Sun, (which is never above 28°.) it appears Dichotomous.

1708 G. Vaux tr. J. C. Sturm Mathesis Juvenilis III. 48 The Phases..offer themselves in view to us from the Earth under the Names of the New-moon, Half-moon, Dichotomous, Gibbous, and Full-moon.

2. Botany and Zoology. Dividing into two, typically equal, branches, esp. repeatedly and successively. Also: of or relating to such branching.

ΘΚΠ

the world > life > biology > physical aspects or shapes > physical arrangement or condition > [adjective] > composed of many parts > branching

dichotomizing1606

branching1720

dichotomous1752

ramulose1753

subramose1797

trichotomous1801

tetrachotomous1829

ramellose1853

alar1858

biramose1877

biramous1877

the world > relative properties > number > specific numbers > two > division into two > [adjective] > division into two categories

dichotomizing1606

dichotomous1752

dichotomic1825

dichotomistic1847

1752 J. Hill Gen. Nat. Hist. III. 23 The short, dichotomous, horned monoculus.

1785 T. Martyn tr. J.-J. Rousseau Lett. Elements Bot. xvii. 233 The Lesser Centaury..is distinguished by its dichotomous stalk.

1842 E. Wilson Anatomist's Vade Mecum (ed. 2) 262 The division of arteries is usually dichotomous.

1872 D. Oliver Lessons Elem. Bot. (new ed.) ii. 185 Common Mistletoe..a dichotomous parasitical shrub, with opposite leathery leaves.

1919 Bot. Gaz. 67 67 The branching in such cases [sc. in mycelial filaments] must be regarded as dichotomous.

1959 P. A. Munz Calif. Flora 556 P[ectocarya] setosa... Stems rather stiff and coarse, erect or ascending, dichotomous.

2010 M. G. Simpson Plant Systemetics (ed. 2) i. 12/1 Of the different types of taxonomic keys, the most common, used in virtually all floras, is a dichotomous key.

3. Involving division into two sharply defined parts or mutually exclusive categories; proceeding by dichotomy. Cf. dichotomic adj.

ΘΚΠ

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

bipartite1574

biparted1586

slit1607

cleft1609

bisected1656

two-parted1793

dichotomized1806

dichotomous1817

dichotomal1818

1817 J. Bentham Chrestomathia Pt. II 292 For division, the dichotomous (i.e. the bifurcate, or two-pronged) mode is most to be commended, when it can conveniently be employed.

a1856 W. Hamilton Lect. Metaphysics (1860) IV. xxv. 30 The division may be not only dichotomous but polytomous, as for example,—angles are right, or acute, or obtuse.

1864 Reader 3 Sept. 304/2 The unities or molecules..are either isovoluminous or in what I have called dichotomous ratio.

1907 Pop. Sci. Monthly May 429 The division of the arts into fine and useful is not dichotomous. One might as well divide the sciences into practical and interesting.

1978 ELH 45 523 The dichotomous catch-alls, ‘romantic’ and ‘classical’..tend to evade the essentially organic process of poetic history and, when applied to Byron and Eliot, easily obscure the mechanism of their poetry.

2002 Church Times 6 Dec. 32/1 Life and death were viewed not as dichotomous, but rather as integral elements of a sacred whole.

This entry has been updated (OED Third Edition, March 2014; most recently modified version published online March 2022).

单词	dichotomous
释义	dichotomousadj. Brit. /dʌɪˈkɒtəməs/, /dᵻˈkɒtəməs/, U.S. /daɪˈkɑdəməs/ Origin: A borrowing from Latin, combined with an English element. Etymons: Latin dichotomos , -ous suffix. Etymology: < post-classical Latin dichotomos, dichotomus halved (4th cent.), (in botany) dividing into two equal branches (1696 in Ray, or earlier; < ancient Greek διχότομος cut in half, equally divided, especially with reference to a half moon < διχο- dicho- comb. form + -τομος : see -tome comb. form) + -ous suffix. Compare dichotomized adj. †1. Astronomy. = dichotomized adj. 2. Obsolete. ΘΚΠ the world > the universe > planet > primary planet > moon > phase > [adjective] > half-illuminated dichotomized1675 dichotomous1675 divided1822 1675 E. Sherburne in tr. M. Manilius Sphere App. 180 In [Mercury's]..greatest Digression from the Sun, (which is never above 28°.) it appears Dichotomous. 1708 G. Vaux tr. J. C. Sturm Mathesis Juvenilis III. 48 The Phases..offer themselves in view to us from the Earth under the Names of the New-moon, Half-moon, Dichotomous, Gibbous, and Full-moon. 2. Botany and Zoology. Dividing into two, typically equal, branches, esp. repeatedly and successively. Also: of or relating to such branching. ΘΚΠ the world > life > biology > physical aspects or shapes > physical arrangement or condition > [adjective] > composed of many parts > branching dichotomizing1606 branching1720 dichotomous1752 ramulose1753 subramose1797 trichotomous1801 tetrachotomous1829 ramellose1853 alar1858 biramose1877 biramous1877 the world > relative properties > number > specific numbers > two > division into two > [adjective] > division into two categories dichotomizing1606 dichotomous1752 dichotomic1825 dichotomistic1847 1752 J. Hill Gen. Nat. Hist. III. 23 The short, dichotomous, horned monoculus. 1785 T. Martyn tr. J.-J. Rousseau Lett. Elements Bot. xvii. 233 The Lesser Centaury..is distinguished by its dichotomous stalk. 1842 E. Wilson Anatomist's Vade Mecum (ed. 2) 262 The division of arteries is usually dichotomous. 1872 D. Oliver Lessons Elem. Bot. (new ed.) ii. 185 Common Mistletoe..a dichotomous parasitical shrub, with opposite leathery leaves. 1919 Bot. Gaz. 67 67 The branching in such cases [sc. in mycelial filaments] must be regarded as dichotomous. 1959 P. A. Munz Calif. Flora 556 P[ectocarya] setosa... Stems rather stiff and coarse, erect or ascending, dichotomous. 2010 M. G. Simpson Plant Systemetics (ed. 2) i. 12/1 Of the different types of taxonomic keys, the most common, used in virtually all floras, is a dichotomous key. 3. Involving division into two sharply defined parts or mutually exclusive categories; proceeding by dichotomy. Cf. dichotomic adj. ΘΚΠ the world > relative properties > number > specific numbers > two > division into two > [adjective] bipartite1574 biparted1586 slit1607 cleft1609 bisected1656 two-parted1793 dichotomized1806 dichotomous1817 dichotomal1818 1817 J. Bentham Chrestomathia Pt. II 292 For division, the dichotomous (i.e. the bifurcate, or two-pronged) mode is most to be commended, when it can conveniently be employed. a1856 W. Hamilton Lect. Metaphysics (1860) IV. xxv. 30 The division may be not only dichotomous but polytomous, as for example,—angles are right, or acute, or obtuse. 1864 Reader 3 Sept. 304/2 The unities or molecules..are either isovoluminous or in what I have called dichotomous ratio. 1907 Pop. Sci. Monthly May 429 The division of the arts into fine and useful is not dichotomous. One might as well divide the sciences into practical and interesting. 1978 ELH 45 523 The dichotomous catch-alls, ‘romantic’ and ‘classical’..tend to evade the essentially organic process of poetic history and, when applied to Byron and Eliot, easily obscure the mechanism of their poetry. 2002 Church Times 6 Dec. 32/1 Life and death were viewed not as dichotomous, but rather as integral elements of a sacred whole. This entry has been updated (OED Third Edition, March 2014; most recently modified version published online March 2022). < adj.1675
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