From half- + island. Compare German Halbinsel (“peninsula”, literally “half-island”), Latin paeninsula (“peninsula”, literally “almost-island”).
"half-island." YourDictionary, n.d. Web. 23 June 2018. <http://www.yourdictionary.com/half-island>.
half-island. (n.d.). Retrieved June 23rd, 2018, from http://www.yourdictionary.com/half-island
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