vitellusn.
/vᵻˈtɛləs/, /vʌɪˈtɛləs/, U.S. /vəˈtɛləs/, /vaɪˈtɛləs/ 1. Embryology. The yolk of an egg; the germinative contents of an ovum-cell.
ΘΚΠ
the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [noun] > ovum or ootid > yolk
yolkeOE
spring1600
vitellary1650
vitellus1728
food-yolk1850
vitellin1857
trophoblast1886
vitelline1891
ovovitellin1906
1728 E. Chambers Cycl. at Egg In the middle of the inner White, is the Vitellus or Yelk.
1826 J. M. Good Bk. Nature I. viii. 186 In this respect the albumen of the cotyledon corresponds with the vitellus of the hen's egg.
1857 M. J. Berkeley Introd. Cryptogamic Bot. xv. 26 Nothing can be more close than the mode of development in these..and of the vitellus in the eggs of certain Mollusca.
1877 T. H. Huxley Man. Anat. Invertebrated Animals 367 In certain Amphipods..the vitellus undergoes complete division.
2.
a. Botany. A fleshy sac situated between the albumen and the embryo in a seed.
ΘΚΠ
the world > plants > part of plant > reproductive part(s) > seed > [noun] > parts of > albumen
albumen1682
yolk1795
perisperm1800
vitellus1807
vitellin1882
phytalbumose1885
phytalbumin1899
1807 J. E. Smith Introd. Physiol. & Systematical Bot. 292 The Vitellus is esteemed by Gærtner to compose the bulk of the seed in Fuci, Mosses and Ferns.
1829 T. Castle Introd. Systematical & Physiol. Bot. 245 The vitellus is an organ of a fleshy but firm texture, situated, when present, between the albumen and embryo.
1861 R. Bentley Man. Bot. ii. iii. 444 Embryo minute, enclosed in a vitellus, and outside of abundant fleshy albumen.
b. (See quot. 1900.)
ΘΚΠ
society > occupation and work > materials > raw material > other vegetable materials > [noun] > waxy materials
wax1799
carnauba wax1854
vitellus1900
1900 B. D. Jackson Gloss. Bot. Terms Vitellus,..an oily substance adhering to the spores of Lycopodium.
This entry has not yet been fully updated (first published 1920; most recently modified version published online December 2021).
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n.1728