frātria

uxor fratris
I. sister-inlaw), Paul. ex Fest. p. 90 Müll.; cf.: fratriae appellantur fratrum inter se uxores, Non. 557, 9; and: fratria, εἰνάτηρ, Gloss. Philox; also called † fratrissa, acc. to Isid. Orig. 9, 7, 17.
Lewis & Short
A Latin Dictionary, 1879
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