Apparently from orphan + -arium. First attested in the American animated sitcom Futurama.
"orphanarium." YourDictionary, n.d. Web. 15 January 2019. <https://www.yourdictionary.com/orphanarium>.
orphanarium. (n.d.). Retrieved January 15th, 2019, from https://www.yourdictionary.com/orphanarium
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