dichotomizedadj.
/dʌɪˈkɒtəmʌɪzd/, /dᵻˈkɒtəmʌɪzd/, U.S. /daɪˈkɑdəˌmaɪzd/ 1. Divided into two sharply defined parts or mutually exclusive classes.
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1614 T. Adams Diuells Banket iv. Ep. Ded. 135 With this last onely haue I medled, endeuouring to declare it, to disswade it; (according to the dichotomiz'd carriage of all our Sermons,) by explication, by application.
1838 J. D'Alton Hist. County Dublin 899 The antiquarian will find here the dichotomised ruin of a castle, once the residence of the Walshes.
1892 A. M. Clerke Familiar Stud. Homer iv. 87 Beyond the rising-places of the sun, where one branch of his dichotomised Ethiopians dwelt.
1904 F. Rolfe Hadrian VII xiii. 275 He had not watched the dichotomized men and Jesuits from the observatory and in the dissecting-room of His loneliness during twenty years for nothing.
1966 B. Brophy Don't never Forget 135 Half of Poe's violently dichotomised imagination was given to creating nightmares in which doom descends in punishment of a guilt whose source is not understood.
2003 L. Moss What Genes can't Do v. 195 The processes of biological change that take place during one generation and those across generations became radically dichotomized.
2. Astronomy. Of the moon or a planet: in the phase at which exactly half the visible disc is sunlit and half is dark. Cf. dichotomy n. 2.In the case of the moon, this occurs twice each month at the first and third quarters.
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the world > the universe > planet > primary planet > moon > phase > [adjective] > half-illuminated
dichotomized1675
dichotomous1675
divided1822
1675 E. Sherburne in tr. M. Manilius Sphere App. 181 On the first of April beheld her of a Gibbous Figure; and on the twentieth of the same Moneth bisected or dichotomised; and on the first of May, and first of September the same year, horned.
1728 E. Chambers Cycl. at Dichotomy She appears Dichotomized at least for the Space of a whole Hour: In which Time, any Moment may be taken for the true Point of the Dichotomy, as well as any other.
1789 J. Cunningham Inq. Copernican Syst. 31 Venus is sometimes new, then horned, and afterwards dichotomized.
1894 J. E. Gore tr. C. Flammarion Pop. Astron. ii. ii. 98 We say that the moon is ‘dichotomised’, or in quadrature; this is the first quarter.
1911 Irish Times 1 June 8/5 By the end of June it [sc. Venus] will have nearly reached the half-moon or ‘dichotomised’ stage.
2012 J. Freely Flame of Miletus viii. 89 During each lunar cycle, at first quarter and last quarter, the moon is dichotomized.
3. Botany and Zoology. Divided into two branches. Cf. dichotomize v.
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the world > relative properties > number > specific numbers > two > division into two > [adjective]
bipartite1574
biparted1586
slit1607
cleft1609
bisected1656
two-parted1793
dichotomized1806
dichotomous1817
dichotomal1818
1806 J. Leslie Dict. Synonymous Words 53/1 Divided, a. disjunct, partile; divided by furrows, sulcated; divided into two, bifidated, dichotomized, bipartile.
1862 7th Ann. Rep. Maine Board Agric. ii. 64 An external stoutish spine or fine soft dichotomized rays.
1922 Bot. Abstr. 10 91 There is a repeatedly dichotomized specimen of C[ycas] circinalis in the gardens.
1977 Amer. Jrnl. Bot. 64 1272 The spiral branching pattern and once dichotomized fertile organs prove to be consistent characters.
2010 E. Galun Phytohormones & Patterning 13. 298 The earliest tracheophytes..lacked side-branches and leaves but consisted of dichotomized stems.
This entry has been updated (OED Third Edition, March 2014; most recently modified version published online March 2022).
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adj.1614