os

Meanings

1. 1
   noun

   a bone, especially when identified by a Latin anatomical name

   Darwin described the os coccyx as a vestigial remnant of an ancestral tail.

Borrowed from Latin os, genitive ossis, 'bone.' The stem oss- also appears in osseous and ossify. English anatomy retained the Latin noun in names such as os coccyx, the coccygeal or tail bone.

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