A protective sheath or covering, particularly referring to structures in zoology such as the chitinous covering around the angle of a bird's jaw.
From Greek 'gony' (knee or angle) plus 'theke' (sheath or case), combining anatomical terms used to describe protective coverings in various organisms.
Scientists love using 'theke' (sheath) as a suffix because it describes all sorts of natural containers—from the beak covers on birds to the protective cases around insect larvae.
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