A non-standard or alternative plural form of epithelium, sometimes used in older medical or scientific literature.
From epithelium using the Latin -ums plural ending. While the standard plural is epithelia, some medical texts used this Latinized plural form, especially in earlier centuries.
Medical terminology can be messy—modern doctors always say 'epithelia' as the plural, but if you're reading a medical text from the 1800s, you might see 'epitheliliums' and have to figure out that they mean the same thing.
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