Resembling byssus in appearance or structure; thread-like or filament-like in quality, as the attachment fibers of mollusks.
From Latin 'byssus' + Greek '-oid' (resembling). The descriptive adjective emerged in biological classification systems to characterize structures that mimic or resemble mussel attachment threads.
Whenever scientists see something thin, stringy, and sticky, they might call it 'byssoid'—basically saying 'it looks and acts like mussel glue!' even if it came from somewhere completely different!
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