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单词 bigeminate
释义

bigeminateadj.

Brit. /bʌɪˈdʒɛmᵻnət/, U.S. /ˌbaɪˈdʒɛmənət/
Origin: Formed within English, by compounding; partly modelled on a Latin lexical item. Etymons: bi- comb. form, geminate adj.
Etymology: < bi- comb. form + geminate adj., in sense 1 after scientific Latin bigeminatus (1732 or earlier). Compare bigeminous adj., bigeminal adj.
1. Botany. Of a leaf: having a petiole that branches dichotomously, esp. with a single pair of leaflets on each secondary petiole; biconjugate. Now rare.
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the world > plants > part of plant > leaf > [adjective] > compound or lobed
cut1565
winged1668
pinnate1687
conjugated1690
trifoliated1698
auriculated1712
auriculate1714
pennate1723
pinnated1725
pennated1727
bigeminate1753
lyrated1753
pedated1753
pinnatifid1753
supradecomposite1753
supradecompound1753
ternated1753
trifoliate1753
lyrate1760
pedate1760
quinate1760
ternate1760
tripinnate1760
palmed1767
bilobated1770
lyre-shaped1778
pennatifid1778
finger-parted1783
superdecompound1783
bipinnate1785
biternate1785
conjugate1785
lobed1787
tergeminate1793
wing-cleft1796
yoked?1803
binate1807
septenate1807
trijugous1813
auricled1821
pinniform1821
multijugous1828
pinnulate1828
trifoliolate1828
bipinnatifid1830
multifoliolate1831
multijugate1831
quinquefoliolate1832
bifoliolate1835
pinnatisected1837
palmatifid1839
tripinnatifid1839
foliate1840
palmatipartite1840
pinnatilobate1840
pinnatipartite1840
pinnatisect1840
bipinnated1842
biconjugate1847
imparipinnate1847
paripinnate1851
pinnatulate1855
polytomous1856
multifoliate1857
pennati-partite1857
pennati-sected1857
ternato-pinnate1857
tripinnatisect1857
patentoternate1859
septemfoliate1859
bipinnatipartite1861
bipinnatisected1861
bipalmate1864
pinnatilobed1866
septenous1866
cut-leaved1870
lobing1870
ternatisect1870
tripinnated1876
trijugate1880
jugate1887
pinnulated1890
trisect1899
tridigitate1900
trigeminous1900
1753 Chambers's Cycl. Suppl. at Leaf Bigeminate Leaf, one formed of a double conjugation of lesser leaves.
1806 B. M'Mahon Amer. Gardener's Cal. 440 There are 84 species of Mimosa described; 2, with simple leaves, 6, with leaves simply pinnate; 3, with bigeminate or tergeminate leaves; [etc.].
1858 H. Drury Useful Plants India 264 Extreme branches pendulous, armed with short straight thorns: leaves bigeminate; leaflets oblong.
1972 D. Burger Seedlings of some Trop. Trees & Shrubs 21 A compound leaf can be doubly compound or several times compound (= decompound), for example..bipinnate or tripinnate, biparipinnate, bigeminate (= biconjugate) or bi-oddpinnate (= bi-imparipinnate).
2. Consisting of or occurring in pairs or two pairs; consisting of two similar parts; (Zoology) (in echinoderms) designating ambulacral pores arranged in two pairs; having such pores (cf. bigeminal adj. 1b).
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1826 Mem. Wernerian Nat Hist. Soc. 5 461 The [thecal] teeth, when 8, bigeminate.
1856 J. W. Griffith & A. Henfrey Micrographic Dict. 600/2 Teeth [of the peristome] thirty-two, connate, in eight bigeminate or sixteen geminate teeth.
1879 A. Napier tr. P. Guttmann Handbk. Physical Diagnosis 182 The cause of the bigeminate pulse has not yet been satisfactorily made out.
1901 Lancet 23 Nov. 1432/1 It is found in the red corpuscles usually in the form of a bigeminate or pear-shaped organism.
1911 Q. Jrnl. Zool. Soc. 67 674 The pores in each pair [of ambulacral plates] are bigeminate.
1912 F. Smith Man. Vet. Physiol. (ed. 4) p. xii The term ‘colliculi’ is now coming into use to denote the corpora quadrigemina. Its shortness is convenient, and it avoids confusion in the case of reptiles, birds, fish, etc., where these structures are bigeminate.
1980 M. K. Durkin in M. Jangoux Echinoderms: Present & Past i. 3/2 Trigeminate plates at ambitus; rest bigeminate.
2003 Cretaceous Res. 24 24/2 Ambulacra subambitally strongly widened with compound plates, bigeminate, occasionally trigeminate superambitally.
This entry has been updated (OED Third Edition, December 2008; most recently modified version published online December 2021).
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adj.1753
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