Plural form: multiple large sailing houseboats traditionally used on the Nile River in Egypt.
Regular English plural of 'dahabiah' + '-es' ending, though the word may also pluralize as 'dahabiahes' or 'dahabiahs' depending on preferred English convention.
When English adopted this Arabic word, we weren't sure how to make it plural—different people used different plural forms, showing how borrowed words struggle before settling into patterns!
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