Definition of "yelk" []

• Obsolete spelling of yolk. (noun)

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• "It contains a mass of viscid nutritive matter -- the 'yelk' -- within which is inclosed a second much more delicate spheroidal bag, called the 'germinal vesicle' (a)."
• "The remains of the yelk, which have not yet been applied to the nutrition and growth of the young animal, are contained in a sac attached to the rudimentary intestine, and termed the yelk sac, or"
• "Special names have been given to these parts of the ovum; the cell-body is called the yelk (vitellus), and the cell-nucleus the germinal vesicle."