yolk cord

1 definition found

yolk cord - Collaborative International Dictionary of English v.0.48 :

  Yolk \Yolk\ (y[=o]lk or y[=o]k; 277), n. [OE. yolke, yelke,
     [yogh]olke, [yogh]elke, AS. geoloca, geoleca, fr. geolu
     yellow. See Yellow.] [Written also yelk.]
     [1913 Webster]
     1. The yellow part of an egg; the vitellus.
        [1913 Webster]
  
     2. (Zool.) An oily secretion which naturally covers the wool
        of sheep.
        [1913 Webster]
  
     Yolk cord (Zool.), a slender cord or duct which connects
        the yolk glands with the egg chambers in certain insects,
        as in the aphids.
  
     Yolk gland (Zool.), a special organ which secretes the yolk
        of the eggs in many turbellarians, and in some other
        invertebrates. See Illust. of Hermaphrodite in Appendix.
        
  
     Yolk sack (Anat.), the umbilical vesicle. See under
        Unbilical.
        [1913 Webster]