"Biovular" is rare. You'll find it mostly in the research literature. People normally refer to "non-identical twins."Do you say "biovular twins" more or "fraternal twins" more for the opposite of "identical twins"?
I just learned the expression "fraternal twins" from keannu and I went on to read on the internet that there is also the term "sororal twins". Is the latter equally common? Could two sisters be called "fraternal twins"?
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