Plural of bacin; multiple small containers or basins, or in anatomy, referring to the pelvic region.
From Latin bacis, plural of bacin. In anatomical terminology, it can also relate to the basin-shaped pelvis, where Latin 'bacis' reflects the shape.
The anatomical meaning connects to the pelvis being called the 'pelvic basin' in medical language—the same shape metaphor that gave the container its name applies to human anatomy.
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