un- + birthday, coined by Lewis Carroll in Through the Looking-Glass (1871).
"unbirthday." YourDictionary, n.d. Web. 18 December 2018. <https://www.yourdictionary.com/unbirthday>.
unbirthday. (n.d.). Retrieved December 18th, 2018, from https://www.yourdictionary.com/unbirthday
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