dicyclicadj.

Brit.

/ˌdʌɪˈsʌɪklɪk/,

/ˌdʌɪˈsɪklɪk/, U.S.

/ˌdaɪˈsaɪklɪk/,

/ˌdaɪˈsɪklɪk/

Origin: Formed within English, by compounding. Etymons: di- comb. form, cyclic adj.

Etymology: < di- comb. form + cyclic adj. Compare bicyclic adj.²

1. Zoology. Of the base of a crinoid's stem: consisting of two rings of plates. Of a crinoid: characterized by such a base. Cf. monocyclic adj. 2a.

ΚΠ

1871 E. Beyrich in Ann. & Mag. Nat. Hist. 7 395 For the sake of brevity, I will indicate the divided bases, according to whether one or two circles are present, as monocyclic or dicyclic.

1900 E. R. Lankester Treat. Zool. III. 111 Monocyclic and dicyclic genera should not be placed in the same line of descent.

1946 H. Woods Palæontol. Invertebr. (ed. 8) 161 In some forms there is below the basals and alternating with them another row of plates (five or three), termed infra-basals,..and the base is then said to be dicyclic.

1961 J. Stubblefield Davies's Introd. Palaeontol. (ed. 3) viii. 193 The few Palaeozoic Flexibilia are dicyclic and impinnate (i.e., arms have no pinnules).

2004 C. Milsom & S. Rigby Fossils at Glance vii. 46/1 (caption) Dicyclic crinoids: have an additional series [of plates], the infrabasals, between the basals and the stem.

2. Chemistry. = bicyclic adj.² 3.

ΚΠ

1897 Jrnl. Physical Chem. 1 439 Thus, monocyclic substances..give (abnormal) depressions in benzene; dicyclic (dihydronaphthalene, quinolin..) normal in benzene, abnormal in naphthalene.

1932 J. L. Simonsen Terpenes II. i. vi. 569 Fenchone is distinguished from other dicyclic ketones by its low boiling-point.

1961 G. M. Badger Chem. Heterocyclic Compounds i. 10 The systematic method for naming dicyclic and polycyclic compounds.

1998 D. Moore Fungal Morphogenesis iii. 118 The C₄₀ carotenoid pigments..include..monocyclic and dicyclic compounds like γ-carotene and β-carotene.

This is a new entry (OED Third Edition, November 2010; most recently modified version published online March 2022).

单词	dicyclic
释义	dicyclicadj. Brit. /ˌdʌɪˈsʌɪklɪk/, /ˌdʌɪˈsɪklɪk/, U.S. /ˌdaɪˈsaɪklɪk/, /ˌdaɪˈsɪklɪk/ Origin: Formed within English, by compounding. Etymons: di- comb. form, cyclic adj. Etymology: < di- comb. form + cyclic adj. Compare bicyclic adj.² 1. Zoology. Of the base of a crinoid's stem: consisting of two rings of plates. Of a crinoid: characterized by such a base. Cf. monocyclic adj. 2a. ΚΠ 1871 E. Beyrich in Ann. & Mag. Nat. Hist. 7 395 For the sake of brevity, I will indicate the divided bases, according to whether one or two circles are present, as monocyclic or dicyclic. 1900 E. R. Lankester Treat. Zool. III. 111 Monocyclic and dicyclic genera should not be placed in the same line of descent. 1946 H. Woods Palæontol. Invertebr. (ed. 8) 161 In some forms there is below the basals and alternating with them another row of plates (five or three), termed infra-basals,..and the base is then said to be dicyclic. 1961 J. Stubblefield Davies's Introd. Palaeontol. (ed. 3) viii. 193 The few Palaeozoic Flexibilia are dicyclic and impinnate (i.e., arms have no pinnules). 2004 C. Milsom & S. Rigby Fossils at Glance vii. 46/1 (caption) Dicyclic crinoids: have an additional series [of plates], the infrabasals, between the basals and the stem. 2. Chemistry. = bicyclic adj.² 3. ΚΠ 1897 Jrnl. Physical Chem. 1 439 Thus, monocyclic substances..give (abnormal) depressions in benzene; dicyclic (dihydronaphthalene, quinolin..) normal in benzene, abnormal in naphthalene. 1932 J. L. Simonsen Terpenes II. i. vi. 569 Fenchone is distinguished from other dicyclic ketones by its low boiling-point. 1961 G. M. Badger Chem. Heterocyclic Compounds i. 10 The systematic method for naming dicyclic and polycyclic compounds. 1998 D. Moore Fungal Morphogenesis iii. 118 The C₄₀ carotenoid pigments..include..monocyclic and dicyclic compounds like γ-carotene and β-carotene. This is a new entry (OED Third Edition, November 2010; most recently modified version published online March 2022). < adj.1871
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