Yolk

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]

From WordNet (r) 2.0 [wn]:

  yolk
       n : nutritive material of an ovum stored for the nutrition of an
           embryo (especially the yellow mass of a bird or reptile
           egg) [syn: {vitellus}]