单词 | non-cyclic |
释义 | non-cyclicadj. 1. That does not form part of a cycle; not involving or relating to cycles. ΚΠ 1891 Philos. Trans. 1890 (Royal Soc.) A. 181 333 That portion of the effect of the first tension which is of a permanent and non-cyclic nature. 1896 Times 21 Sept. 8/1 The report..deals with non-cyclic effects—that is, the differences between the mean values of the magnetic elements at the beginning and end of each magnetically ‘quiet’ day. 1920 Mod. Philol. 17 614 If he borrowed from the Prose Lancelot at all, his source was the earlier, non-cyclic, form. 1946 F. E. Zeuner Dating Past xi. 341 There are superimposed cycles, or non-cyclic changes of a considerably longer duration. 1962 D. R. Corson & P. Lorrain Introd. Electromagn. Fields v. 203 If the vectors are permuted in noncyclic order, the sign is changed. 1988 G. J. Whitrow Time in Hist.: Evol. Gen. Awareness iv. 53 Our modern idea of time's unidirectional non-cyclic nature. 2000 B. R. Simms Atonal Music A. Schoenberg iii. 48 The annotation ‘4 Lieder’ may indicate that Schoenberg's initial conception of the Hanging Gardens was for a short, noncyclic collection of songs. 2. Chemistry. Having or designating a molecular structure containing no closed rings of atoms. ΚΠ 1904 Jrnl. Physical Chem. 8 361 The author's results can be summed up for non-cyclic compounds in the formula [etc.]. 1932 Proc. Royal Soc. B. 111 489 It may well be that simpler anthracine derivatives with non-cyclic substituents at 1, 2, 5 and 6 will be carcinogenic. 1956 P. A. S. Smith Interaction of Azido Group in Organic Compounds with Adjacent Functional Groups (Univ. Michigan, Engineering Research Inst.) 4 It is hoped to be able to establish the structures of the products as cyclic or non-cyclic by spectrographic means. 2002 Inorg. Chim. Acta 332 146/2 Comparing with the rich variety of polymetallic systems of non-cyclic oxamides, those containing macrocyclic oxamides are rather limited. This entry has been updated (OED Third Edition, December 2003; most recently modified version published online March 2022). < |
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