An alternative spelling of bryozoan using the diaeresis (two dots) over the final 'o' to indicate separate vowel sounds.
This is a variant orthographic form of bryozoan, using the diaeresis mark common in 19th-century English scientific writing to clarify pronunciation of adjacent vowels.
The diaeresis mark is becoming rarer in modern English, but you still see it in words like 'cooperate' and 'naïve'—it's a tiny typographic rescue signal saying 'these vowels are separate, not one sound!'
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