Definition of "natal day" [natal day]

• The date on which a person was born (noun)

WordNet. Princeton University. 2010.

• "February came along and our friends on the outside were making a great jubilee over the day, it occurred to some of us on the inside that we had as good, if not better, right to enthuse over George's natal day than they had; and a committee was appointed to wait on the Little Giant, who was asleep in his room, and demand that he come out at once and give us a counter blast on patriotism."
• "Praetextatus [an evident error for Domitilla] the natal day of Nereus and Achilleus, and the natal day of St. Pancratius, on the Aurelian"