Peninsula

google

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mid 16th century: from Latin paeninsula, from paene ‘almost’ + insula ‘island’.

wiktionary

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Borrowed from Latin paenīnsula, from paene(“almost”), and īnsula(“island”).

etymonline

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peninsula (n.)

"piece of land almost surrounded by water but connected with a mainland by a neck or isthmus," 1530s, from Latin paeninsula "a peninsula," literally "almost an island," from pæne "nearly, almost, practically," which is of uncertain origin, + insula "island" (see isle). In 16c. sometimes Englished as demie island.