sectorialadj.1n.
/sɛkˈtɔːrɪəl/, U.S. /sɛkˈtɔriəl/ Of or pertaining to a sector.
a. Pertaining to the instrument called a sector (sector n. 3, 4).
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the world > relative properties > number > mathematical instruments > [adjective]
sectoral1778
sectorial1803
1803 Philos. Trans. (Royal Soc.) 93 387 The principles on which he has founded the several improvements, consist in the means of uniting the sectorial tube to its axis.
1808 Troughton in Philos. Trans. (Royal Soc.) 99 130 The sectorial arc must also be adjusted to its proper radius.
1841 Penny 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. 1a, 1b).
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the world > space > shape > other specific shapes > [adjective] > sector of circle or sphere
sectorial1867
1867 W. Thomson & P. G. Tait Treat. Nat. Philos. I. §781. 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.].
1867 W. Thomson & P. G. Tait Treat. Nat. Philos. I. §781. 621 The sectorial harmonics of order i [etc.].
1880 Williamson in Encycl. Brit. XIII. 50/2 If the sectorial area APCP, be represented by S, the preceding result gives [etc.].
c. Botany. Applied to a type of chimæra (see quot. 1968). Also as n. [ < German sektorialchimäre (E. Baur 1909, in Zeitschr. f. induktive Abstammungs- u. Vererbungslehre I. 342).]
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1927 Jrnl. Genetics 18 257 In a sectorial plant a sector (of the stem) is formed of tissue of another species or type.
1927 Jrnl. Genetics 18 257 Sectorials of the type to which the term is restricted in this paper are of very rare occurrence.
1934 W. 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.
1959 New Biol. 30 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 R. Rieger et al. Gloss. Genetics & Cytogenetics 59 Chimeras..in plants may be classified..according to their structure into a) sectorial (different tissues grow side by side and occupy distinct sectors of varying size), b) periclinal (different tissues are disposed one with the other..), c) mericlinal (actually an interrupted periclinal..).
Derivatives
secˈtorially adv. in or into sectors.
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1963 Heredity XVIII. 266 These plants have..a sectorially divided growing point.
This entry has not yet been fully updated (first published 1911; most recently modified version published online March 2022).
sectorialadj.2
/sɛkˈtɔːrɪəl/, U.S. /sɛkˈtɔriəl/ Having the function of cutting; the distinctive epithet of the premolar teeth.
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the world > life > the body > digestive or excretive organs > digestive organs > mouth > types or spec. teeth > [adjective] > carnassial
sectorial1845
carnassial1849
1845 R. Owen Odontography 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.
1875 C. C. Blake Zoology 22 We perceive in the Lion large pointed canine teeth,..and a series of sectorial teeth behind them.
1881 St. G. Mivart Cat 28 The third premolar is yet larger..and from its trenchant shape is called the upper sectorial tooth.
This entry has not yet been fully updated (first published 1911; most recently modified version published online March 2022).
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adj.1n.1803
adj.21845