| 释义 |
▪ I. sectorial, a.1 (and n.)|sɛkˈtɔərɪəl|
[f. sector n. + -ial.]
Of or pertaining to a sector. a. Pertaining to the instrument called a sector (sector n. 4, 5).
1803Phil. Trans. XCIII. 387 The principles on which he has founded the several improvements, consist in the means of uniting the sectorial tube to its axis. 1808Troughton ibid. XCIX. 130 The sectorial arc must also be adjusted to its proper radius. 1841Penny Cycl. XXI. 180/1 The others [scales] are merely laid down for convenience on such blank spaces as are left by the converging or sectorial scales.
b. Pertaining to a sector of a circle or a sphere (see sector n. 1 a, 1 b).
1867Thomson & Tait Nat. Philos. §781 I. 621 These circles..are either (1.) all in parallel planes..and cut the spherical surface into zones, in which case the harmonic is called zonal; or (2.) they..cut the surface into equal sectors, in which case the harmonic is called sectorial; or (3.) some [etc.]. Ibid., The sectorial harmonics of order i [etc.]. 1880Williamson in Encycl. Brit. XIII. 50/2 If the sectorial area APCP, be represented by S, the preceding result gives [etc.].
c. Bot. Applied to a type of chimæra (see quot. 1968). Also as n. [ad. G. sektorialchimäre (E. Baur 1909, in Zeitschr. f. induktive Abstammungs- u. Vererbungslehre I. 342).]
1927Jrnl. Genetics XVIII. 257 In a sectorial plant a sector (of the stem) is formed of tissue of another species or type. Ibid., Sectorials of the type to which the term is restricted in this paper are of very rare occurrence. 1934W. Neilson Jones Plant Chimaeras & Graft Hybrids ii. 18 True sectorial chimaeras are relatively uncommon; most of the plants recorded as ‘sectorials’ were probably mericlinal in structure. 1959New Biol. XXX. 38 The first composite branch to arise had one side producing tomato leaves and the other producing nightshade leaves, and it was, therefore, concluded that the branch was composed half of tomato tissue and half of nightshade tissue. This type of structure is known as a Sectorial chimera. 1968[see periclinal a. 2 b].
Hence secˈtorially adv., in or into sectors.
1963Heredity XVIII. 266 These plants have..a sectorially divided growing point.
▪ II. sectorial, a.2|sɛkˈtɔərɪəl|
[f. mod.L. sectōrius (f. L. sector cutter: see sector n.) + -al1.]
Having the function of cutting; the distinctive epithet of the premolar teeth.
1840–5Owen Odontogr. I. 475 In most Carnivora one molar tooth on each side of both jaws has its crown modified,..for reacting upon the opposite tooth, like the blades of scissors,..whence Cuvier has applied to this tooth the name of ‘Dent carnassière’, which I have rendered ‘dens sectorius’, sectorial, or scissor-tooth. 1875Blake Zool. 22 We perceive in the Lion large pointed canine teeth,..and a series of sectorial teeth behind them. 1881Mivart Cat 28 The third premolar is yet larger..and from its trenchant shape is called the upper sectorial tooth. |