| 释义 |
‖ primordium|praɪˈmɔːdɪəm|
Pl. -ia.
[L. prīmordium n., orig. neut. of prīmordius adj., original, f. prīmus first + ordīrī to begin.]
a. The very beginning, the earliest stage; opening part, introduction; primitive source, origin.
1671Howe Wks. (1834) 199/1 (Stanf.) The mere preludes of this glory, the primordia, the beginnings of it. 1677― Work Holy Spirit vi. Wks. 1832 I. 66 They..want the radical, fundamental preparation; the primordia, or first principles by which they are to be adopted to that kingdom. 1704Swift T. Tub viii. §3 Those Beings must be of chief Excellence wherein that Primordium appears most prominently to abound. 1846R. Garnett in Proc. Philol. Soc. II. 212 It would seem more probable that those roots are in many cases the real primordia of the ostensible d'hatoos or verbal roots. 1847Lytton Lucretia i. i, This is the primordium,—now comes the confession.
b. Biol. The first rudiment or germ of an organ or structure. In Embryol. = anlage.
1875Bennett & Dyer tr. Sachs's Text-bk. Bot. ii. 531 In Primulaceæ..five protuberances (primordia) appear on the receptacle above the calyx, each of which grows up into a stamen. 1898A. Willey in Nature 25 Aug. 390/1 The word that commends itself to me [for the German ‘Anlage’].. is primordium. 1908F. R. Lillie Devel. of Chick 8 The ovum is the primordium of the individual, the ectoderm the primordium of all ectodermal structures,..the first thickening of the ectoderm over the optic cup the primordium of the lens, etc. 1935Jrnl. Morphol. LVIII. 425 The primitive mesenteron..consists of a single layer of squamous epithelium dorsal to the attachments of the cardiac primordia, and two layers ventral to them. 1965Bell & Coombe tr. Strasburger's Textbk. Bot. 115 The primordia of the leaves arise at the apex from the outer layers of cells. 1978M. J. T. FitzGerald Human Embryol. ix. 75 At the end of the fifth week the primordia of the hands and feet are already apparent. |