Webster's English Dictionary

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yolk

yolk or yoke \'yo-k, 'yo-lk\ \'yo-(l)kt\ \'yo-(l)-ke-\ n [ME yolke, fr. OE 
   geoloca, fr. geolu yellow - more at YE] [akin to MD ieke yolk (of wool), OE 
   e-owu ewe]LLOW 1a: the yellow spheroidal mass of stored food that forms the 
   inner portion  of the egg of a bird or reptile and is surrounded by the 
   white archaic  1b: the whole contents of an ovum consisting of a 
   protoplasmic formative po rtion and an inert nutritive portion 1c: the 
   material stored in an ovum that supplies food material to the devel oping 
   embryo and consists chiefly of proteins, lecithin, and cholesterol 2: oily 
   material in unprocessed sheep wool consisting of wool fat, suint, a nd 
   debris - yolked aj