bigeminaladj.

Brit.

/bʌɪˈdʒɛmᵻnl/, U.S.

/ˌbaɪˈdʒɛmən(ə)l/

Origin: A borrowing from Latin, combined with an English element. Etymons: Latin bigeminus , -al suffix¹.

Etymology: < post-classical Latin bigeminus (1732 or earlier; < classical Latin bi- bi- comb. form + geminus twofold, double: see geminous adj.) + -al suffix¹. In sense 1a after post-classical Latin corpora bigemina ( S. T. Soemmerring De Corporis Humani Fabrica (1798) IV. i. 62). In sense 2 after scientific Latin pulsus bigeminus ( L. Traube Gesammelte Beiträge zur Pathol. u. Physiol. (1871) I. xxii. 448). Compare earlier quadrigeminal adj. and bigeminous adj., bigeminate adj.

1. Zoology.

a. Designating the optic lobes of the midbrain of lower vertebrates, and the anterior pair (or, rarely, both pairs) of the quadrigeminal bodies of mammals; cf. quadrigeminal adj. 2. Now rare.

ΘΚΠ

the world > life > the body > nervous system > cerebrospinal axis > brain > parts of brain > [adjective] > cerebrum > other parts of cerebrum

bigeminal1824

super-cerebral1889

tegmental1890

amygdalar1959

right brain1962

1824 Trans. Phrenol. Soc. 204 I have made innumerable experiments to discover the results of injuries done to the bigeminal tubercles.

1843 Penny Cycl. XXV. 66/2 The optic lobes, or bigeminal bodies, are two spherical bodies, as in fishes, not divided into four by a transverse fissure, as in mammals.

1870 G. Rolleston Forms Animal Life Introd. 53 The bigeminal hollow optic lobes.

1928 F. W. Jones & S. D. Porteus Matrix of Mind i. xl. 283 We have only to contrast the small superior quadrigeminal bodies of man with the vast bigeminal bodies of the lower vertebrates to realise how small..an element of vision is the basal photostatic element.

1951 Evolution 5 8/2 Olfactory lobes strongly developed, cerebral hemispheres smaller, and bigeminal lobes less projecting than in a recent bird.

1997 McGraw-Hill Encycl. Sci. & Technol. (ed. 8) XI. 734 The mesencephalic evaginations form the bigeminal bodies in lower forms and the quadrigeminal bodies in higher forms.

b. Of the ambulacral pores or their arrangement in echinoderms: bigeminate (bigeminate adj. 2); biserial. Now rare or disused.

ΚΠ

1874 Philos. Trans. (Royal Soc.) 164 722 Diplocidaris seems to have some claim to generic rank on account of its tendency to a bigeminal arrangement of the pores.

1891 Jrnl. Linn. Soc.: Zool. 23 300 They [sc. pairs of pores] may placed so that there are two vertical series, one nearer the ambulacral–interradial suture than the other, they are then termed ‘biserial’ (bigeminal of authors).

1946 H. Woods Palæontol. Invertebr. (ed. 8) 134 The pores are said to be bigeminal or biserial.

2. Medicine. Designating an abnormal pulse or cardiac arrhythmia in which beats occur in pairs. Cf. bigeminy n.

ΘΚΠ

the world > health and disease > ill health > a disease > disorders of internal organs > disordered pulse or circulation > [adjective] > other pulse disorders

harda1398

rare1565

soft1571

large1612

bigeminal1877

bigeminous1881

Adams–Stokes1896

Stokes-Adams1903

quadrigeminal1906

1877 Monthly Abstr. Med. Sci. 4 361 In the intervals the pulse-tracings showed first the bigeminal, then a trigeminal and alternating character.

1880 Lancet 11 Dec. 950/2 Knoll found that in animals increased arterial pressure was capable of causing a retardation in the action of the heart, and a bigeminal pulse.

1926 Amer. Heart Jrnl. 2 218 The blood pressure findings which are characteristic of pulsus alternans may also be found in patients..with bigeminal rhythm.

1974 V. B. Mountcastle et al. Med. Physiol. (ed. 13) II. xxxiii. 865/1 Such premature beats are called interpolated extrasystoles and give rise to bigeminal rhythm.

1991 S.N. Dyer July Ward in J. Morrow Nebula Awards 28 (1994) 124 As counterpoint, the unit's sole heart monitor beeps an out-of-sync 80/minute, with the occasional interposed beat of an extra systole, or the brief syncopation of a bigeminal rhythm.

This entry has been updated (OED Third Edition, December 2008; most recently modified version published online June 2022).

单词	bigeminal
释义	bigeminaladj. Brit. /bʌɪˈdʒɛmᵻnl/, U.S. /ˌbaɪˈdʒɛmən(ə)l/ Origin: A borrowing from Latin, combined with an English element. Etymons: Latin bigeminus , -al suffix¹. Etymology: < post-classical Latin bigeminus (1732 or earlier; < classical Latin bi- bi- comb. form + geminus twofold, double: see geminous adj.) + -al suffix¹. In sense 1a after post-classical Latin corpora bigemina ( S. T. Soemmerring De Corporis Humani Fabrica (1798) IV. i. 62). In sense 2 after scientific Latin pulsus bigeminus ( L. Traube Gesammelte Beiträge zur Pathol. u. Physiol. (1871) I. xxii. 448). Compare earlier quadrigeminal adj. and bigeminous adj., bigeminate adj. 1. Zoology. a. Designating the optic lobes of the midbrain of lower vertebrates, and the anterior pair (or, rarely, both pairs) of the quadrigeminal bodies of mammals; cf. quadrigeminal adj. 2. Now rare. ΘΚΠ the world > life > the body > nervous system > cerebrospinal axis > brain > parts of brain > [adjective] > cerebrum > other parts of cerebrum bigeminal1824 super-cerebral1889 tegmental1890 amygdalar1959 right brain1962 1824 Trans. Phrenol. Soc. 204 I have made innumerable experiments to discover the results of injuries done to the bigeminal tubercles. 1843 Penny Cycl. XXV. 66/2 The optic lobes, or bigeminal bodies, are two spherical bodies, as in fishes, not divided into four by a transverse fissure, as in mammals. 1870 G. Rolleston Forms Animal Life Introd. 53 The bigeminal hollow optic lobes. 1928 F. W. Jones & S. D. Porteus Matrix of Mind i. xl. 283 We have only to contrast the small superior quadrigeminal bodies of man with the vast bigeminal bodies of the lower vertebrates to realise how small..an element of vision is the basal photostatic element. 1951 Evolution 5 8/2 Olfactory lobes strongly developed, cerebral hemispheres smaller, and bigeminal lobes less projecting than in a recent bird. 1997 McGraw-Hill Encycl. Sci. & Technol. (ed. 8) XI. 734 The mesencephalic evaginations form the bigeminal bodies in lower forms and the quadrigeminal bodies in higher forms. b. Of the ambulacral pores or their arrangement in echinoderms: bigeminate (bigeminate adj. 2); biserial. Now rare or disused. ΚΠ 1874 Philos. Trans. (Royal Soc.) 164 722 Diplocidaris seems to have some claim to generic rank on account of its tendency to a bigeminal arrangement of the pores. 1891 Jrnl. Linn. Soc.: Zool. 23 300 They [sc. pairs of pores] may placed so that there are two vertical series, one nearer the ambulacral–interradial suture than the other, they are then termed ‘biserial’ (bigeminal of authors). 1946 H. Woods Palæontol. Invertebr. (ed. 8) 134 The pores are said to be bigeminal or biserial. 2. Medicine. Designating an abnormal pulse or cardiac arrhythmia in which beats occur in pairs. Cf. bigeminy n. ΘΚΠ the world > health and disease > ill health > a disease > disorders of internal organs > disordered pulse or circulation > [adjective] > other pulse disorders harda1398 rare1565 soft1571 large1612 bigeminal1877 bigeminous1881 Adams–Stokes1896 Stokes-Adams1903 quadrigeminal1906 1877 Monthly Abstr. Med. Sci. 4 361 In the intervals the pulse-tracings showed first the bigeminal, then a trigeminal and alternating character. 1880 Lancet 11 Dec. 950/2 Knoll found that in animals increased arterial pressure was capable of causing a retardation in the action of the heart, and a bigeminal pulse. 1926 Amer. Heart Jrnl. 2 218 The blood pressure findings which are characteristic of pulsus alternans may also be found in patients..with bigeminal rhythm. 1974 V. B. Mountcastle et al. Med. Physiol. (ed. 13) II. xxxiii. 865/1 Such premature beats are called interpolated extrasystoles and give rise to bigeminal rhythm. 1991 S.N. Dyer July Ward in J. Morrow Nebula Awards 28 (1994) 124 As counterpoint, the unit's sole heart monitor beeps an out-of-sync 80/minute, with the occasional interposed beat of an extra systole, or the brief syncopation of a bigeminal rhythm. This entry has been updated (OED Third Edition, December 2008; most recently modified version published online June 2022). < adj.1824
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