| 释义 |
urkingdom, n. Taxon.|ˈʊəkɪŋdəm|
[f. ur- + kingdom n.]
One of the highest taxonomic groups of organisms, proposed in some classifications, spec. each of the three groups comprising the archaebacteria, the eubacteria, and the eukaryotes.
1977Woese & Fox in Proc. Nat. Acad. Sci. LXXIV. 5088/2 The highest phylogenetic unit in the prokaryotic domain we think should be called an ‘urkingdom’—or perhaps ‘primary kingdom’. 1983Nature 10 Feb. 512/1 The recently defined novel order Thermoproteales, which, together with the order represented by Sulfolobus, forms a distinct division of the urkingdom of the archaebacteria. 1985Proc. Nat. Acad. Sci. LXXXII. 3716/1 Photosynthetic bacteria have previously been classified in two urkingdoms. |