(noun) fast -running African flightless bird with two-toed feet; largest living bird
(noun) a person who refuses to face reality or recognize the truth (a reference to the popular notion that the ostrich hides from danger by burying its head in the sand)
Definitions for Yolk
(noun) nutritive material of an ovum stored for the nutrition of an embryo (especially the yellow mass of a bird or reptile egg)
(noun) the yellow spherical part of an egg that is surrounded by the albumen