SYN: yolk (1). [L.]
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vi·tel·lus -'tel-əs n the egg cell proper including the yolk but excluding any albuminous or membranous envelopes also YOLK
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n.
the yolk of an ovum.
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vi·tel·lus (vĭ-telґəs) [L.] yolk (def. 1).Medical dictionary. 2011.