heterocyclicadj.n.
A. adj.
1. Botany. = heteromerous adj. 2b.
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the world > plants > part of plant > reproductive part(s) > flower or part containing reproductive organs > [adjective] > having specific arrangement or number of member parts
regular1760
decandrous1808
irregular1826
tetramerous1835
pentamerous1848
symmetrical1849
hexamerous1857
isomerous1857
octamerous1857
anisomerous1861
octomeral1871
hemicyclic1875
zygomorphic1875
zygomorphous1879
tetracyclic1880
heteromerous1882
heterocyclic1895
oligomerous1897
pleiomerous1898
decasepalous-
1895 S. H. Vines Students' Text-bk. Bot. 500 When the whorls are heteromerous the flowers are said to be heterocyclic.
1924 R. M. Holman & W. W. Robbins Textbk. Gen. Bot. vii. 228 The flowers of the great majority of plants are heterocyclic.
2. Chemistry. Pertaining to or containing a ring of atoms of more than one kind. Opposed to homocyclic, isocyclic.
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the world > matter > chemistry > organic chemistry > [adjective] > organic structure > cyclic or ring compounds > heterocyclic
heterocyclic1899
1899 E. F. Smith tr. V. von Richter Org. Chem. (ed. 3) I. 78 In the case of many heterocyclic compounds..the substances with open chains from which they may be theoretically deduced do not really exist.
1900 Proc. Chem. Soc. 6 Feb. 11 The action of bases on ethyl phenyl~propiolate gives rise to heterocyclic compounds.
1936 L. J. Desha Org. Chem. xxiv. 479 In the most typical heterocyclic compounds, the ring systems are extremely stable.
1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) VI. 427/2 Heterocyclic systems are encountered in many groups of organic compounds, both synthetic and natural.
B. n.
A heterocyclic compound.
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the world > matter > chemistry > organic chemistry > organic compounds > [noun] > heterocyclic compounds
heterocyclic1956
the world > matter > chemistry > organic chemistry > [noun] > organic structure > cyclic or ring compounds > heterocyclic
heterocycle1909
heterocyclic1956
1956 Nature 16 June 1116/2 The oxygenated heterocyclics were discussed with emphasis on the biochemical aspects.
1968 New Scientist 31 Oct. 268/3 Classification of heterocyclics into suitable groups is somewhat of a problem.
Derivatives
ˈheterocycle n. a heterocyclic ring or compound.
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the world > matter > chemistry > organic chemistry > [noun] > organic structure > cyclic or ring compounds > heterocyclic
heterocycle1909
heterocyclic1956
1909 Webster's New Internat. Dict. Eng. Lang. Heterocycle, a heterocyclic compound.
1931 Jrnl. Amer. Chem. Soc. 53 806 Ethylene oxide, the simplest oxygen heterocycle.
1957 E. H. Rodd Chem. Carbon Compounds IV a Introd. 1 Compounds containing these heterogeneous rings (heterocycles) are classed as heterocyclic.
This entry has not yet been fully updated (first published 1976; most recently modified version published online June 2019).
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adj.n.1895