Eebster the Great wrote:That's false. If you in fact define "chicken egg" literally as "an egg containing a chicken," then the chicken must have come first, or at least at the same time as the chicken egg, because you cannot have a chicken egg without a chicken inside it.
Grocery store eggs are still generally accepted as "chicken eggs", despite never containing a chicken. There's no reason "chicken egg" should necessarily be defined as "egg containing a chicken", and for the purposes of the question...that's not the definition that is used. It's also not a controversial claim that a fertilized egg cell is not considered an actual viable member of the species when first fertilized (and an egg is generally fully formed within the day fertilization occurs).
(Hell, if you follow that linguistic route, the chicken's egg cell certainly came first.)